callouses
cal-lous-es
verb
To cause skin to become thick and hard through repeated friction or pressure.
"Heavy lifting callouses the palms of the hands."
noun
Areas of skin that have become thick and hard due to repeated friction or pressure.
"The guitarist developed callouses on his fingertips."
Thesaurus
Synonyms: cauterize, callous, cauterise, toughened, thickened, calloused, tough, indurate, insensitive, pachydermatous