Definition of callosity in English:

callosity

noun

technical
  • A thickened and hardened part of the skin; a callus.

    • ‘Because the heads bear distinguishing patches of rough skin, called callosities, a good overhead view allows scientists to recognize an individual whale, year after year.’
    • ‘He had wagered that she would be a Teutonic heavyweight with callosities growing on her forehead.’
    • ‘The patterns are made up of rough, raised patches of skin called callosities.’
    • ‘These are called callosities, and their colouration varies with the reproductive season.’
    • ‘During these beatings, she would clench fists, which led to thick callosity on her fingers.’

Origin

Late Middle English: from French callosité, from Latin callositas, from callosus hard-skinned, from callum, callus hardened skin.

Pronunciation:

callosity

/kəˈlɒsɪti/