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ischium

[is-kee-uh m]
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noun, plural is·chi·a [is-kee-uh] /ˈɪs ki ə/. Anatomy.
  1. the lower portion of either innominate bone.
  2. either of the bones on which the body rests when sitting.
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Origin of ischium

1640–50; < Latin < Greek ischíon hip-joint
Related formsis·chi·ad·ic [is-kee-ad-ik] /ˌɪs kiˈæd ɪk/, is·chi·at·ic [is-kee-at-ik] /ˌɪs kiˈæt ɪk/, is·chi·al, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for ischium

Historical Examples

  • The symphysis is long and includes part of both pubis and ischium.

    The Vertebrate Skeleton

    Sidney H. Reynolds

  • Both pubis and ischium contribute to the symphysis which is often very long.

    The Vertebrate Skeleton

    Sidney H. Reynolds

  • The pubis is slender, and the ischium is elevated and robust.

  • 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.


British Dictionary definitions for ischium

ischium

noun plural -chia (-kɪə)
  1. one of the three sections of the hipbone, situated below the ilium
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Derived Formsischial, adjective

Word Origin

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

n.

"the seat bone," 1640s, from Latin, from Greek iskhion "hip joint," in plural, "the hips," probably from iskhi "loin," of unknown origin.

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Online Etymology Dictionary, © 2010 Douglas Harper

ischium in Medicine

ischium

(ĭskē-əm)
n. pl. is•chi•a (-kē-ə)
  1. 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
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Related formsis′chi•adic (-ădĭk) adj.ischi•al (-əl) adj.is′chi•atic (-ătĭk) adj.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

ischium in Science

ischium

[ĭskē-əm]
Plural ischia
  1. 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.
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The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.