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

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

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
(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.