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is·chi·a(is'kē-ŭm, is'kē-ī, is'kē-ă), [TA] Avoid the mispronunciation ish'ē-ŭm.
The lower and posterior part of the hip bone, distinct at birth but later becoming fused with the ilium and pubis; it consists of a body, where it joins the ilium and superior ramus of the pubis to form the acetabulum, and a ramus joining the inferior ramus of the pubis.
[Mod. L. fr. G. ischion, hip]