Hypertext Webster Gateway: "Ischial"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Ischial \Is"chi*al\, a. (Anat.)
Of or pertaining to the ischium or hip; ischiac; ischiadic;
ischiatic.
{Ischial callosity} (Zo["o]l.), one of the patches of
thickened hairless, and often bright-colored skin, on the
buttocks of many apes, as the drill.
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