- the lower portion of either innominate bone.
- either of the bones on which the body rests when sitting.
Origin of ischium
1640–50; < Latin < Greek ischíon hip-joint
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for ischium
The symphysis is long and includes part of both pubis and ischium.
Both pubis and ischium contribute to the symphysis which is often very long.
The pubis is slender, and the ischium is elevated and robust.Neotropical Hylid Frogs, Genus Smilisca
William E. Duellman
These two portions, pubis and ischium, limit an oval orifice, the subpubic foramen.
In them the arch is a mere slot, and being formed by the ischium alone, merits the name of the ischial arch.
- one of the three sections of the hipbone, situated below the ilium
C17: from Latin: hip joint, from Greek iskhion
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Word Origin and History for ischium
"the seat bone," 1640s, from Latin, from Greek iskhion "hip joint," in plural, "the hips," probably from iskhi "loin," of unknown origin.
Online Etymology Dictionary, © 2010 Douglas Harper
- The lowest of the three major bones that constitute each half of the pelvis, distinct at birth but later becoming fused with the ilium and pubis.ischial bone
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
- The lowest of the three major bones that constitute each half of the pelvis, distinct at birth but later becoming fused with the ilium and pubis.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.