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Webster 1913 Edition

(ĭs′kĭ-al)

Adj.

(Anat.)

Of or pertaining to the ischium or hip; ischiac; ischiadic; ischiatic.

Ischial callosity

(Zool.)

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