Akademik

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. SYN: os ischii [TA], ischial bone. [Mod. L. fr. G. ischion, hip]

is·chi·um 'is-kē-əm n, pl is·chia -ə the dorsal and posterior of the three principal bones composing either half of the pelvis consisting in humans of a thick portion, a large rough eminence on which the body rests when sitting, and a forwardly directed ramus which joins that of the pubis

a bone forming the lower part of each side of the hip bone (see also pelvis).

• ischiac • schial adj.