os ischii

is·chi·um

, gen.

is·chi·i

, pl.

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.

Synonym(s): os ischii [TA], ischial bone

[Mod. L. fr. G. ischion, hip]