diameter

di·am·e·ter

noun \dī-ˈam-ət-ər\

Definition of DIAMETER

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>