n. The lowest of the three bones that make up each side of the pelvis.
The Century Dictionary and Cyclopedia
n. In anatomy, the posterior part of the pelvic arch in vertebrates, the lowermost of the three parts forming the os innominatum.
n. In Crustacea, the third joint of the normally 7-jointed leg; the ischiopodite.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. one of the three sections of the hipbone; situated below the ilium
Word Usage
"At the level of a line extending from the lower part of the symphysis pubis to the spine of the ischium is a thickened whitish band in this upper layer of the diaphragmatic part of the pelvic fascia."