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 ?
Farinella (Universite de Pise) sur l'Asteroide Eros qui mesure 22 km de diametre, donc le double de celui qui a impacte le sol Maya.
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.
Le pot, de plus de deux metres de diametre et 1,60 m de hauteur, a ete presente devant plus de 10.
The project will involve processing of one billion standard cubic feet per day of high pressure gas and transporting it from the Abu Dhabi Marine Operating Company's (Adma-Opco) offshore Umm Shaif field via a new 46 inch diametre pipeline to Adgas's integrated gas development facility on Das Island.
Pochtaruk says for the 100-metre high towers to be structurally stable, the welded plate must be cone-shaped with a diametre of six metres at the base and four metres at the top.
This area appears to be characterized by a 2km in diametre Tertiary volcanic centre that constitutes the northeastern extension of the Tertiary mineralized belt that includes the mineral deposits of Bajo de la Alumbrera (Cu-Au) and Agua Rica (Cu, Au, Mo, Ag).
2Mm Diametre And The Breaking Load Of The Rope As Per Specification Is:3459-2004 Tab.
La lune se situe a 16800 km (2,33 le rayon terrestre) et son diametre est de 908 km et que sa lumiere n'est plus liee au soleil : c'est un corps brillant.
Le toit de cette bibliotheque a ete concu sous forme circulaire de 15 metres de diametre sur une hauteur de 16 metres, precise la meme source.
The new project, part of Dewa's push to improve and expand its infrastructure, includes the planning and laying of new water pipe distribution networks ranging in size from 100 to 450 milimetres in diametre, and over a total length of 30km.
D'un diametre de 18 mm, cette bague en or ornee d'un diamant et d'un saphir tailles en poire, disposes "en toi et moi", etait estimee (hors frais) entre 8.
Large diametre pipe production was shut down to remove the pipe, find the cause and make repairs.