Ischial /(ĭs"kĭ*al)/

Is·chi·al

Ischial

a.
  1. Of or pertaining to the ischium or hip; ischiac; ischiadic; ischiatic. (Anat.)

Phrases & Compounds
Ischial callosity
one of the patches of thickened, hairless, and often bright-colored skin, on the buttocks of many apes, as the drill.