Callus
/kˈæləs/
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Definition
(noun) A hardened area of the skin (especially on the foot or hand) caused by repeated friction, wear or use.
Sentence Examples
I have a callus on the sole of my foot.
My fingers are starting to callus over. I love it for some reason.
CEFR Practice Quiz
He developed a thick ____ on his thumb from playing the guitar daily.