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ischium

[is-kee-uh m] /ˈɪs ki əm/
noun, plural ischia
[is-kee-uh] /ˈɪs ki ə/ (Show IPA).
Anatomy.
1.
the lower portion of either innominate bone.
2.
either of the bones on which the body rests when sitting.
Origin of ischium
1640-1650
1640-50; < Latin < Greek ischíon hip-joint
Related forms
ischiadic
[is-kee-ad-ik] /ˌɪs kiˈæd ɪk/ (Show IPA),
ischiatic
[is-kee-at-ik] /ˌɪs kiˈæt ɪk/ (Show IPA),
ischial, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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Examples from the Web for ischium
Historical Examples
  • Both pubis and ischium contribute to the symphysis which is often very long.

    The Vertebrate Skeleton Sidney H. Reynolds
  • The symphysis is long and includes part of both pubis and ischium.

    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.

  • The posterior and external angle of the ischium is rough and prominent; it is the tuberosity of the ischium.

  • The ischium forms a plate of bone which, in part, closes the external portion of the cavity of the pelvis.

  • We further note a muscle of the same kind, and presenting the same aspect, which comes from the tuberosity of the ischium.

  • The superior is formed by the gluteal muscles; the inferior corresponds to the tuberosity of the ischium.

  • It arises above from the inferior surface of the ischium, and from the tuberosity of the same bone.

British Dictionary definitions for ischium

ischium

/ˈɪskɪəm/
noun (pl) -chia (-kɪə)
1.
one of the three sections of the hipbone, situated below the ilium
Derived Forms
ischial, 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
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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.

Online Etymology Dictionary, © 2010 Douglas Harper
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ischium in Medicine

ischium is·chi·um (ĭs'kē-əm)
n. pl. is·chi·a (-kē-ə)
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. Also called ischial bone.


is'chi·ad'ic (-ād'ĭk) adj.
is'chi·al (-əl) adj.
is'chi·at'ic (-āt'ĭk) adj.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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ischium in Science
ischium
  (ĭs'kē-əm)   
Plural ischia
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 © 2002. Published by Houghton Mifflin. All rights reserved.
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