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]

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is·chi·um 'is-kē-əm n, pl is·chia 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

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

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is·chi·um (isґke-əm) pl. isґchia [L., from Gr. ischion hip] TA alternative for os ischii. See Plate 40.

Medical dictionary. 2011.

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