Definitions

1. noun

A thickened area of skin resulting from repeated pressure or friction, or an abnormal thickening of tissue in a plant.

“The hiker developed a callus on her heel from wearing the new hiking boots.”

2. noun

A hard, usually rounded, lump or growth on a plant or tree, especially a woody plant, caused by a wound or disease.

“The tree had several calluses on its trunk after being damaged by lightning.”