Akademik

1. A straight line connecting two opposite points on the surface of a more or less spherical or cylindrical 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]

- anteroposterior d. of the pelvic inlet SYN: median conjugate.

- biparietal d. the d. of the fetal head between the two parietal eminences.

- buccolingual d. the d. of the crown of a tooth measured from the buccal to the lingual surfaces.

- conjugate d. of pelvic inlet SYN: median conjugate.

- conjugate d. of pelvic outlet SYN: straight conjugate.

- diagonal conjugate d. SYN: diagonal conjugate.

- external conjugate d. SYN: external conjugate.

- d. obliqua [TA] SYN: oblique d..

- oblique d. [TA] a measurement across the pelvic inlet from the sacroiliac joint of one side to the opposite iliopectineal eminence. SYN: d. obliqua [TA].

- obstetric conjugate d. SYN: true conjugate.

- occipitofrontal d. the d. of the fetal head from the external occipital protuberance to the most prominent point of the frontal bone in the midline.

- occipitomental d. the d. of the fetal head from the external occipital protuberance to the midpoint of the chin.

- posterior sagittal d. distance from the sacrococcygeal junction to the middle of an imaginary line running between the left and right ischial tuberosities.

- suboccipitobregmatic d. the d. of the fetal head from the lowest posterior point of the occipital bone to the center of the anterior fontanelle.

- total end- diastolic d. (TEDD) cross sectional d. of the left ventricle including the septum and posterior wall thicknesses in diastole.

- total end- systolic d. (TESD) cross sectional d. of the left ventricle including the septum and posterior wall thicknesses in systole.

- trachelobregmatic d. the d. of the fetal head from the middle of the anterior fontanelle to the neck.

- d. transversa [TA] SYN: transverse d..

- transverse d. [TA] the transverse d. of the pelvic inlet, measured between the terminal lines. SYN: d. transversa [TA].

- zygomatic d. the extreme breadth of the skull at the zygomatic arches.

di·am·e·ter dī-'am-ət-ər n

1) a unit of magnification for an optical instrument equal to the number of times the linear dimensions of an object are apparently increased <a microscope magnifying 60 \diameters>

2) one of the maximal breadths of a part of the body <the transverse \diameter of the inlet of the pelvis>