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callus (n.)

"hardened skin," 1560s, from Latin callus, variant of callum "hard skin," related to callere "be hard," from Proto-Italic *kaln/so- "hard;" PIE source uncertain. Likely cognates are Old Irish calath, calad, Welsh caled "hard;" Old Church Slavonic kaliti "to cool, harden," Russian kalit "to heat, roast," Serbo-Croatian kaliti "to temper, case-harden."

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Definitions of callus from WordNet
1
callus (n.)
an area of skin that is thick or hard from continual pressure or friction (as the sole of the foot);
Synonyms: callosity
callus (n.)
bony tissue formed during the healing of a fractured bone;
callus (n.)
(botany) an isolated thickening of tissue, especially a stiff protuberance on the lip of an orchid;
2
callus (v.)
cause a callus to form on;
The long march had callused his feet
callus (v.)
form a callus or calluses;
His foot callused
From wordnet.princeton.edu