Etymology
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ischium (n.)

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

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Definitions of ischium

ischium (n.)
one of the three sections of the hipbone; situated below the ilium;
Synonyms: ischial bone / os ischii
From wordnet.princeton.edu