diameter

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diameter

 [di-am´ĕ-ter]
the length of a straight line passing through the center of a circle and connecting opposite points on its circumference; hence the distance between the two specified opposite points on the periphery of a structure such as the cranium or pelvis.
cranial d's (craniometric d's) imaginary lines connecting points on opposite surfaces of the cranium; the most important are biparietal, that joining the parietal eminences; bitemporal, that joining the extremities of the coronal suture; cervicobregmatic, that joining the center of the anterior fontanel and the junction of the neck with the floor of the mouth; frontomental, that joining the forehead and chin; occipitofrontal, that joining the external occipital protuberance and the most prominent midpoint of the frontal bone; occipitomental, that joining the external occipital protuberance and the most prominent midpoint of the chin; suboccipitobregmatic, that joining the lowest posterior point of the occiput and the center of the anterior fontanel.
pelvic diameter see pelvic diameter.

di·am·e·ter

(dī-am'ĕ-tĕr),
1. A straight line connecting two opposite points on the surface of a more or less spheric or cylindric body, or at the boundary of an opening or foramen, passing through the center of such body or opening.
2. The distance measured along such a line.
[G. diametros, fr. dia, through, + metron, measure]

diameter

/di·am·e·ter/ (di-am´ĕ-ter) the length of a straight line passing through the center of a circle and connecting opposite points on its circumference. Symbol d.
anteroposterior diameter  the distance between two points located on the anterior and posterior aspects, respectively, of the structure being measured, such as the true conjugate diameter of the pelvis or occipitofrontal diameter of the skull.
Baudelocque's diameter  external conjugate d.; see pelvic d.
conjugate diameter  see pelvic d.
cranial diameters  distances measured between certain landmarks of the skull, such as biparietal, that between the two parietal eminences; bitemporal, that between the two extremities of the coronal suture; cervicobregmatic, that between the center of the anterior fontanel and the junction of the neck with the floor of the mouth; frontomental, that between the forehead and chin; occipitofrontal, that between the external occipital protuberance and most prominent midpoint of the frontal bone; occipitomental, that between the external occipital protuberance and the most prominent midpoint of the chin; suboccipitobregmatic, that between the lowest posterior point of the occiput and the center of the anterior fontanel.
pelvic diameter  any diameter of the pelvis, such as diagonal conjugate, joining the posterior surface of the pubis to the tip of the sacral promontory; external conjugate, joining the depression under the last lumbar spine to the upper margin of the pubis; true (internal) conjugate, the anteroposterior diameter of the pelvic inlet, measured from the upper margin of the pubic symphysis to the sacrovertebral angle; oblique, joining one sacroiliac articulation to the iliopubic eminence of the other side; transverse (of inlet), joining the two most widely separated points of the pelvic inlet; transverse (of outlet), joining the medial surfaces of the ischial tuberosities.
Enlarge picture
Diameters of pelvic inlet (see also pelvic planes ).

diameter (D)

[dī·am′ə·tər]
Etymology: Gk, diametros
1 the length of a straight line passing through the center of a circle and connecting opposite points on its circumference.
2 the distance between two specified opposite points on the periphery of a structure such as the cranium or pelvis.

di·am·e·ter

(dī-am'ĕ-tĕr)
1. A straight line connecting two opposite points on the surface of a more or less spheric or cylindric body, or at the boundary of an opening or foramen, passing through the center of such body or opening.
2. The distance measured along such a line.
[G. diametros, fr. dia, through, + metron, measure]

diameter

the length of a straight line passing through the center of a circle and connecting opposite points on its circumference; hence the distance between the two specified opposite points on the periphery of a structure such as the cranium or pelvis.

cranial d's, craniometric d's
imaginary lines connecting points on opposite surfaces of the cranium.
pelvic diameter
any of the diameters of the pelvis; any measurement that expresses the diameter of the birth canal in the female.
References in periodicals archive ?
he diametre of a moon's orbit correlates directly to how long each track is.
5cm in diametre (6-in , 8in & 93/4in) for pounds 19.
For example, we are currently studying the use of bigger nets with holes having bigger diametre so that baby fishes are spared and only bigger ones are caught," he added.
They can also weave a web of more than one metre in diametre.
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A Fried Development Plan based on supply of Mazarani gas to SSGCL at their Larkana gas injection point, through a 100 km long 9 inch diametre pipeline has been approved by the Government.
A cable of 13mm diametre (as thick as your thumb) may contain 50 fibres, each as thick as a human hair.
Ces paraboles de petit diametre permettent a Orblynx de deployer IDS dans des delais et a des couts inferieurs a d'autres systemes, permettant aux FAI et aux operateurs de mettre en oeuvre rapidement ce systeme d'amelioration de la qualite de la distribution des contenus.
The arrays consist of 25 poly (propylene fumarate) microneedles, each needle having a tip and base diametre of 20 micrometre and 200 micrometre, respectively, and a height of one mm.
Il est ainsi procede au changement des canalisations par la pose de nouvelles conduites de 315 ml de diametre, a precise Said Ben-Alioua.
Major Ali Saqr Sultan Al Suweidi, president of Emirates Marine Environmental Group (EMEG), said there were a total of 80 eggs with an average recorded diametre of 2.
The newly formed island is stretched about a mile off the coast and is about 100 feet in diametre, according to reports.