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
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
Examples from the web for ischium
  • It is attached to this fascia along a line which pursues a somewhat irregular course to the spine of the ischium.
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
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.

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.
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.