line (redirected from drew a line in the sand)

line (līn)

1. a stripe, streak, or narrow ridge.

2. an imaginary line connecting different anatomic landmarks.lin´ear

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absorption lines  dark lines in the spectrum due to absorption of light by the substance through which the light has passed.

anocutaneous line  pectinate l.

Beau's lines  transverse furrows on the fingernails, usually a sign of a systemic disease but also due to other causes.

bismuth line  a thin blue-black line along the gingival margin in bismuth poisoning.

blood line  a line of direct descent through several generations.

cement line  a line visible in microscopic examination of bone in cross section, marking the boundary of an osteon (haversian system).

cervical line  anatomical designation for the cementoenamel junction, the dividing line between the crown and root portions of a tooth.

cleavage lines  linear clefts in the skin indicative of direction of the fibers.

Anterior (A) and posterior (B) views of cleavage lines of the skin.

costoclavicular line  parasternal l.

line of Douglas  a crescentic line marking the termination of the posterior layer of the sheath of the rectus abdominis muscle.

epiphyseal line 

1. a plane or plate on a long bone, visible as a line, marking the junction of the epiphysis and diaphysis.

2. a strip of lesser density on the radiograph of a long bone, representing that plane or plate.

lines of expression  the natural skin lines and creases of the face and neck; the preferred lines of incision in facial and cervical surgery.

gingival line 

1. a line determined by the level to which the gingiva extends on a tooth.

2. any linear mark visible on the surface of the gingiva.

gluteal line  any of the three rough curved lines (anterior, inferior, and posterior) on the gluteal surface of the ala of the ilium.

Harris lines  lines of retarded growth seen radiographically at the epiphyses of long bones.

hot line  see under H.

iliopectineal line  a ridge on the ilium and pubes showing the brim of the true pelvis.

intertrochanteric line  a line running obliquely from the greater to the lesser trochanter on the anterior surface of the femur.

lead line  a gray or bluish black line at the gingival margin in lead poisoning.

mammary line  see under ridge.

mammillary line  an imaginary vertical line passing through the center of the nipple.

median line  an imaginary line dividing the body surface equally into right and left sides.

milk line  mammary ridge.

mylohyoid line  a ridge on the inner surface of the lower jaw from the base of the symphysis to the ascending rami behind the last molar tooth.

nasobasilar line  one through the basion and nasion.

Nélaton's line  one from the anterior superior spine of the ilium to the most prominent part of the tuberosity of the ischium.

nuchal lines  three lines (inferior, superior, highest) on the outer surface of the occipital bone; see also external occipital crest.

parasternal line  an imaginary line midway between the mammillary line and the border of the sternum.

pectinate line  one marking the junction of the zone of the anal canal lined with stratified squamous epithelium and the zone lined with columnar epithelium.

pectineal line 

1. a line running down the posterior surface of the shaft of the femur, giving attachment to the pectineus muscle.

2. the anterior border of the superior ramus of the pubis.

semilunar line  a curved line along the lateral border of each rectus abdominis muscle, marking the meeting of the aponeuroses of the internal oblique and transverse abdominal muscles.

Shenton's line  a curved line seen in radiographs of the normal hip, formed by the top of the obturator foramen.

sternal line  an imaginary vertical line on the anterior body surface, corresponding to the lateral border of the sternum.

subcostal line  a transverse line on the surface of the abdomen at the level of the lower edge of the tenth costal cartilage.

Sydney line  a palmar crease correlated with an increased risk for leukemia and other malignancies in childhood.

temporal line 

1. either of the curved ridges, inferior and superior, on the outside of the parietal bone, continuous with the temporal line of the frontal bone.

2. a ridge extending superiorly and posteriorly from the zygomatic process of the frontal bone.

terminal line of pelvis  one on the inner surface of each pelvic bone, from the sacroiliac joint to the iliopubic eminence anteriorly, separating the false from the true pelvis.

trapezoid line  a ridge on the inferior surface of the clavicle for attachment of the trapezoid ligament.

Voigt's line  a dorsoventral pigmented line of demarcation on the skin along the lateral edge of the biceps muscle; seen in 20 to 26 per cent of blacks and rarely in whites.

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line (ln)

n.

1. The path traced by a moving point.

2. A thin continuous mark, as that made by a pen, pencil, or brush applied to a surface.

3. A crease in the skin, especially on the face; a wrinkle.

4. In anatomy, a long narrow mark, strip, or streak distinguished from adjacent tissue by color, texture, or elevation.

5. A real or imaginary mark positioned in relation to fixed points of reference.

6. A border, boundary, or demarcation.

7. A contour or an outline.

8. A mark used to define a shape or represent a contour.

9. Any of the marks that make up the formal design of a picture.

10. A cable, rope, string, cord, or wire.

11. A general method, manner, or course of procedure.

12. A manner or course of procedure determined by a specified factor.

13. An official or prescribed policy.

14. Ancestry or lineage.

15. A series of persons, especially from one family, who succeed each other.

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line

Etymology: L, linea

1 a connection between two points.

2 a stripe, streak, or narrow ridge, often imaginary, that serves to connect reference points or to separate various parts of the body, as the hairline or nipple line.

3 a black absorption line in a continuous spectrum passing through a medium.

4 an accretion line in the enamel of a tooth marking successive layers of calcification.

5 a catheter or wire that may be inserted in a vein, as in an IV line.

6 the base line of an electrocardiogram when neither positive nor negative potentials are recorded.

7 also called linea. line of sight. See also Frankfurt horizontal plane.

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line,

n a boundary; demarcation.

line angle,

n See angle, line.

line, basophilic,

n a group of microscopic sections of bone that stains darkly with hematoxylin. Represents periods of bone inactivity.

line, Camper's,

n.pr the line running from the inferior border of the ala of the nose to the superior border of the tragus of the ear.

line, cement,

n the line of cement exposed at the margin of an inlay or crown.

line, cementing,

n a basophilic line distinguishing adjacent lamellae of bone; represents periods of inactivity of bone formation and resorption.

line, cervical,

n See junction, cementoenamel.

line, cross arch fulcrum,

n See line, fulcrum, cross arch.

line, external oblique,

n a ridge of osseous structure on the body of the mandible extending from the anterolateral border to the mandibular ramus, passing downward and forward, after covering the buccocervical portion of the mandibular third molar, and ending by blending into the molar teeth.

line, finish,

n in cavity preparations, a minimal line of demarcation of the wall of the preparation at the cavosurface angle; usually results from a slice made by an abrasive disk.

line focus,

n a principle employed in the design of radiographic tubes, by which the effective focal spot is sharply reduced relative to the actual (larger) focal spot desirable to deal with the heat generated. It involves focusing the cathode stream, in the pattern of a thin rectangle, onto an anode truncated at about 20° to the transverse axis of the tube. See also spot, focal, effective.

line, fulcrum,

n an imaginary line around which a removable partial denture tends to rotate.

line, fulcrum, anteroposterior,

n an imaginary line of rotation extending through the rest and other support areas along the same side of a removable partial denture.

line, fulcrum, cross arch,

n an imaginary line through the tooth-supported rest areas nearest to soft tissue-supported areas and around which the partial denture will tend to rotate when forces are applied to the soft tissue-supported areas.

line, lead,

n a bluish-black patch on the gingival tissues, usually about 1 mm from the gingival crest. Caused by the deposition of fine granules of lead sulfide in the tissues. A sign of lead absorption in lead poisoning (plumbism).

line, median,

n the intersection of the midsagittal plane with the maxillary and mandibular dental arches. The center line divides the central body surface into right and left.

line, mercurial,

n a linear area of abnormal pigmentation of the gingival tissues associated with mercury poisoning. Seen along the gingival margin, it has been variously described as bluish, brownish, dirty reddish, or purplish in coloration.

line, neonatal,

n the microscopic imbrication line on a primary tooth marking the point at which prenatal growth stops and postnatal growth begins. See line, Owen contour.

line of credit,

n an arrangement whereby a financial institution (bank or insurance company) commits itself to lend up to a specified maximum amount of funds during a specified period. The interest rate on the loan may be specified or not. Sometimes a commitment fee is imposed for obtaining the line of credit.

line of draw,

n the direction or plane of withdrawal or seating of a removable or cemented restoration.

line of force,

n See force, line of.

line of occlusion,

n the alignment of the occluding surfaces of the teeth in the horizontal plane. See also plane, occlusal line.

line of Retzius,

n.pr one of several microscopic incremental lines appearing in the mature enamel.

line, Owen contour,

n.pr one of a series of adjoining microscopic imbrication lines in dentin that demonstates a disturbance in body metabolism. See line, neonatal.

line, petrous

(pet´rs),
n the line traced around the hard, dense portion of temporal bone that forms a case protecting the inner ear.

line printer,

n a fast printing device. A line printer prints on paper each line of characters in one operation, rather than character by character.

line, protrusive,

n one of the three tracings made on each of the six projection planes of a jaw motion data recorder.

line, survey,

n a line produced on the various portions of a dental cast by a surveyor, scriber, or marker. It designates the greatest height of contour in relation to the orientation of the cast to the vertical scriber.

line, vibrating,

n the imaginary line across the posterior part of the palate marking the division between the movable and relatively immovable tissues of the palate.

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line

1. a stripe, streak, mark, or narrow ridge; often an imaginary line connecting different landmarks. See also linea.

2. conversion of a broad beam of x-rays to a pencil beam.

3. a single consignment of livestock from one farm. Said of a group of cattle or sheep notable for their homogeneity.

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absorption l's

dark lines in the spectrum due to absorption of light by the substance through which the light has passed.

line block

a nerve block of local anesthesia produced by infiltrating the anesthetic along a line that the incision is to take.

blue line

lead line (below).

cell line

see cell culture.

cement line

a line visible in microscopic examination of bone in cross section, marking the boundary of an osteon (haversian system).

cervical line

see cemento-enamel junction.

cleavage l's

linear clefts in the skin indicative of direction of the fibers.

line dressing

a system of handling carcasses in an abattoir. The carcasses move along an overhead chain line past a series of stations where the dressing and meat inspection is done.

line focus

utilization of a broad beam of electrons for the generation of x-rays by a rotating anode so that the area of the target on which the electrons fall is spread over a line instead of a point.

gingival line

1. a line determined by the level to which the gingiva extends on a tooth; called also gum line.

2. any linear mark visible on the surface of the gingiva.

gum line

gingival line (1).

iliopectineal line

the ridge on the ilium and pubes showing the brim of the true pelvis.

incremental l's

lines supposedly showing the successive layers deposited in a tissue, as in the tooth enamel.

intertrochanteric line

one running obliquely from the greater to the lesser trochanter.

lead line

a bluish line at the edge of the gums in lead poisoning. Rarely seen in animals.

median line

an imaginary vertical line dividing the body equally into right and left parts.

milk line

1. the line of thickened epithelium in the embryo along which the mammary glands are developed.

2. the metal tube in a milking machine along which the milk, after extraction from the cow, passes to the storage vat.

mylohyoid line

a ridge on the inner surface of the lower jaw from the base of the symphysis to the ascending rami behind the last molar tooth.

pectinate line

one marking the junction of the zone of the anal canal lined with stratified squamous epithelium and the zone lined with columnar epithelium.

physeal line

one on the surface of an adult long bone, marking the junction of the epiphysis and diaphysis.

pleural reflection line

line of the junction between costal and diaphragmatic pleurae.

semilunar line

a curved line along the lateral border of each rectus abdominis muscle, marking the meeting of the aponeuroses of the internal oblique and transverse abdominal muscles.

temporal line

a curved ridge on the external surface of the cranium that marks the origin of the temporal muscle.

terminal line

one on the inner surface of each pelvic bone, from the sacroiliac joint to the iliopubic eminence cranially, separating the false from the true pelvis, and marking the pelvic inlet.

line transects

a technique for estimating the density of a population, e.g. the number of deer per hectare in a gamepark.

visual line

a line from the point of vision of the retina to the object of vision; called also visual axis.

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line

1. The connection between two points. 2. In anatomy, a long narrow band or streak that is distinct from the surrounding tissues by colour or texture.
base line The line joining the centres of rotation of the two eyes. It is approximately equal to the interpupillary distance (Fig. L20). See interocular distance.
demand line The line in Donders' diagram that represents the perfect amount of convergence required for each level of accommodation, for single binocular vision. Syn. orthophoria line; Donders' line.
line of direction Line joining an object in space with its image on the retina (allowing for the optical properties of the eye). The line joining the fixation point to the fovea is called the principal line of direction. However, the object appears to lie along a visual direction and that direction in visual space associated with the fovea is called the principal visual direction. All other visual directions associated with other retinal points are called secondary visual directions. The principal line of direction and the principal visual direction coincide, but the former indicates the direction towards the eye, while the latter indicates the direction away from the eye. See law of identical visual directions.
Donders' line See demand line.
Egger's line See ligament of Wieger.
Ferry's line A line containing iron located in the corneal epithelium and adjacent to limbal filtering blebs. It may occur as a result of trabeculectomy.
line of fixation See fixation axis.
Fleischer's line See Fleischer's ring.
focal line Any astigmatic optical system produces two mutually, usually perpendicular, focal lines of a point object. The focal lines are situated at different image distances. Each focal line lies parallel to its associated cylinder axis. Syn. image line; line focus; Sturm's line. See circle of least confusion; conoid of Sturm; interval of Sturm.
line focus See focal line.
Fraunhofer's line's Fine dark lines distributed throughout the length of the solar spectrum due to the absorption of specific wavelengths by elements in the atmosphere of the sun and the earth. Fraunhofer observed about 600 of these lines and denoted the most prominent ones by letters from A in the extreme red to K in the violet. Examples: A corresponds to 759.4 nm, C to 656.3 nm, D to 589.3 nm, F to 486.1 nm, etc. See constringence; solar spectrum.
line of Gennari A distinctive white stripe in the middle of the fourth layer of the visual cortex containing the termination of the optic radiation fibres, as well as intracortical connections. The stripe appears above and below the calcarine fissure except in the most anterior part of the fissure where it only appears below. Syn. area striata; stria of Gennari. See visual area; calcarine fissure.
Hudson-Stähli line A yellowish-brown, more or less horizontal line containing iron which runs across the cornea below the centre. It occurs in normal corneas, more frequently in the elderly, or in association with corneal opacities.
iron line Deposits of iron within the corneal epithelium appearing as a brown rust line. They often subside with time leaving a nebulous scar. Several eponymous types have been described depending on the cause and location. See Hudson-Stähli line; Stocker's line; Coat's white ring; Fleischer's ring; siderosis bulbi.
median line Line formed by the intersection of the median plane and the plane of regard (Fig. L20). Syn. midline.
orthophoria line See demand line.
phoria line On Donders' diagram, it is the line joining all the points representing the passive position of the eyes corresponding to various levels of accommodation.
principal line of vision See line of sight.
pupillary line See pupillary axis.
retinal line Operationally, the collection of retinal elements that are activated in response to a line stimulus.
Sampaolesi's line A pigmented, wavy line anterior to Schwalbe's ring and found mainly in the periphery of the inferior cornea. It may be noted with gonioscopy in pigmentary dispersion syndrome and pseudoexfoliation syndrome.
line of Schwalbe See anterior limiting ring of Schwalbe.
line of sight Line joining the point of fixation to the centre of the entrance pupil. This line is more practical than the visual axis. Syn. principal line of vision.
line spectrum See line spectrum.
Stocker's line An abnormal line containing iron located in the corneal epithelium which may appear in front of the advancing edge of a pterygium.
Sturm's line See focal line.
visual line See visual axis.

Fig. L20 Base line C₁ C₂ and median line. The base line is situated about 13

Table L3 Common spectral lines of the visible spectrum
designation	origin	wavelength (nm)
A	oxygen	759.4
C	hydrogen	656.3
C′	cadmium	643.8
D	sodium	589.3
d	helium	587.6
e	mercury	546.1
F	hydrogen	486.1
F′	cadmium	480.0
G	calcium	430.8
h	hydrogen	410.2

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line

Clinical medicine A popular term for an IV catheter Drug slang An elongated trail of relatively pure pulverized cocaine, usually snorted through a straw  Telemedicine A telecommunication wire or other conduit. See Copper line, Digital subscriber line, Hotline, Medline, Leased line, T-1 line, T-3 line Vox populi A 2-D streak or mark or strip. See Bottom line, E-1 line, Fine line, Frankfort (horizontal) line, Gatekeeper guideline, Harvard guideline, Iliopectineal line, Intertrochanteric line, Lead line, Marionette line, Midclavicular line, Ohngren's line, Regression line, Skinner's line, Squamocolumnar Z line.

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Patient discussion about drew a line in the sand.

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Q. can i get lung cancer from second hand smoking? what is the red line amount? how long do i need to expose to a smoking environment before i risk lung cancer ?

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