{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. [1913 Webster]
The Collaborative International Dictionary of English. 2000.
ischial callosity — noun A thickened piece of skin found on the buttocks of animals, especially the baboon … Wiktionary
Ischial — Is chi*al ([i^]s k[i^]*al), a. (Anat.) Of or pertaining to the ischium or hip; ischiac; ischiadic; ischiatic. [1913 Webster] {Ischial callosity} (Zo[ o]l.), one of the patches of thickened, hairless, and often bright colored skin, on the buttocks … The Collaborative International Dictionary of English
Callosity — A callosity is another name for callus, a piece of skin that has become thickened as a result of repeated contact and friction. When occurring on an animals buttocks, as with baboons, they are specifically called ischial callosities.Otherwise the … Wikipedia
