callus
Pronunciation: /ˈkaləs/
(also callous)
noun
- a thickened and hardened part of the skin or soft tissue, especially in an area that has been subjected to friction.
- Medicine the bony healing tissue which forms around the ends of broken bone.
- Botany a hard formation of tissue, especially new tissue formed over a wound:
Origin:
mid 16th century: from Latin callus (more commonly callum) 'hardened skin'