1. Callosity is an noun, plural callosities according to parts of speech

2. Callosity (countable and uncountable, plural callosities) A callus (uncountable) A callous demeanour; insensitivity or hardheartedness

3. Other articles where Ischial Callosity is discussed: monkey: Old World monkeys versus New World monkeys: …hard, bare “sitting pads” (ischial callosities) on the buttocks; New World monkeys lack these