triple point (redirected from Triple point of water)

point (point)

1. a small area or spot; the sharp end of an object.

2. to approach the surface, like the pus of an abscess, at a definite spot or place.

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point A  a radiographic, cephalometric landmark, determined on the lateral head film; it is the most retruded part of the curved bony outline from the anterior nasal spine to the crest of the maxillary alveolar process.

acupuncture point  acupoint.

point B  a radiographic cephalometric landmark, determined on the lateral head film; it is the most posterior midline point in the concavity between the infradentale and pogonium.

boiling point  the temperature at which a liquid will boil; at sea level, water boils at 100°C (212°F).

cardinal points 

1. the points on the different refracting media of the eye that determine the direction of the entering or emerging light rays.

2. four points within the pelvic inlet—the two sacroiliac articulations and the two iliopectineal eminences.

craniometric point  one of the established points of reference for measurement of the skull.

far point  the remotest point at which an object is clearly seen when the eye is at rest.

point of fixation 

1. the point on which the vision is fixed.

2. the point on the retina on which are focused the rays coming from an object directly regarded.

freezing point  the temperature at which a liquid begins to freeze; for water, 0°C, or 32°F.

isoelectric point  the pH of a solution at which a charged molecule does not migrate in an electric field.

jugal point  the point at the angle formed by the masseteric and maxillary edges of the zygomatic bone.

lacrimal point  the opening on the lacrimal papilla of an eyelid, near the medial angle of the eye, into which tears from the lacrimal lake drain to enter the lacrimal canaliculi.

McBurney point  a point of special tenderness in appendicitis, about one-third the distance between the right anterior superior iliac spine and the umbilicus.

McBurney point.

point of maximal impulse  the point on the chest where the impulse of the left ventricle is felt most strongly, normally in the fifth costal interspace inside the mammillary line. Abbreviated PMI.

melting point  (mp) the minimum temperature at which a solid begins to liquefy.

near point  the nearest point of clear vision, the absolute near p. being that for either eye alone with accommodation relaxed, and the relative near p. that for both eyes with the employment of accommodation.

nodal points  two points on the axis of an optical system situated so that a ray falling on one will produce a parallel ray emerging through the other.

pressure point 

1. a point that is particularly sensitive to pressure.

2. one of various locations on the body at which digital pressure may be applied for the control of hemorrhage.

Various pressure points used to control hemorrhage.

subnasal point  the central point at the base of the nasal spine.

trigger point  a spot on the body at which pressure or other stimulus gives rise to specific sensations or symptoms.

triple point  the temperature and pressure at which the solid, liquid, and gas phases of a substance are in equilibrium.

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triple point

n.

The temperature and pressure at which three different phases, such as gaseous, liquid, and solid phases, of a particular substance can coexist in equilibrium.

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triple point,

the combination of temperature and pressure in which a given substance may exist in solid, liquid, and vapor forms, all in equilibrium at the same time. Every substance has a theoretic triple point.

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point

1. a small area or spot; the sharp end of an object.

2. to approach the surface, like the pus of an abscess, at a definite spot or place.

3. a single tine of an antler.

4. extremities of a sheep fleece which has been removed from the sheep and laid out on a classing table.

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auricular point

the center of the opening of the external acoustic meatus.

boiling point

the temperature at which a liquid will boil: at sea level, 212°F (100°C).

point of buttock

the prominence caused by the ischial tuberosity.

point of croup

highest point of the croup; caused by the sacral tuberosity.

dew point

the temperature at which moisture in the atmosphere is deposited as dew.

point of the elbow

the summit of the olecranon process.

point firing

see firing.

freezing point

the temperature at which a liquid begins to freeze; for water, 32°F (0°C).

point of the hip

the most lateral point of the hip; caused by the coxal tuberosity.

point of the hock

the summit of the calcaneus.

ice point

the temperature of equilibrium between ice and air-saturated water under one atmosphere pressure.

isobestic point

the wavelength at which two substances have the same absorptivity.

isoelectric point (pI)

the pH of a solution in which molecules of a specific substance, such as a protein, have equal numbers of positively and negatively charged groups and therefore do not migrate in an electric field.

lacrimal point

lacrimal puncta.

point of lay

the age of sexual maturity in female fowls.

point of maximal impulse (PMI)

the point on the chest where the impulse of the left ventricle is felt most strongly. It is usually on the left chest wall, around the area of the 5th costochondral junction.

melting point

the minimum temperature at which a solid begins to liquefy.

nodal p's

two points on the axis of an optical system situated so that a ray falling on one will produce a parallel ray emerging through the other.

point outbreak

see point epidemic.

paper point

very fine, tapered swabs used in endodontics to dry up the root canal.

point prescriptions

details of the exact needle procedures and locations of insertions for the treatment of specific diseases.

point prevalence rate

the proportion of the animals in a population at a point in time which are affected by the subject disease at that point. Called also instantaneous prevalence.

point selection

can be based on a table of prescriptions for specific diseases, or on the basis of which acupoints are tender, or on the basis of the innervation of the area of the lesion, and so on for a series of 11, and possibly more, strategies.

point of the shoulder

the point over the greater tubercle of the humerus.

point source epidemic

see point epidemic.

point of the sternum

the most cranial point of the sternum, caused by the manubrium.

trigger point

a spot on the body at which pressure or other stimulus gives rise to specific sensations or clinical signs.

triple point

the temperature and pressure at which the solid, liquid, and gas phases of a substance are in equilibrium.