callus

Noun	1.	callus - an area of skin that is thick or hard from continual pressure or friction (as the sole of the foot) callosity hardening - abnormal hardening or thickening of tissue clavus, corn - a hard thickening of the skin (especially on the top or sides of the toes) caused by the pressure of ill-fitting shoes
	2.	callus - bony tissue formed during the healing of a fractured bone chestnut - a small horny callus on the inner surface of a horse's leg cicatrice, cicatrix, scar - a mark left (usually on the skin) by the healing of injured tissue
	3.	callus - (botany) an isolated thickening of tissue, especially a stiff protuberance on the lip of an orchid botany, phytology - the branch of biology that studies plants plant process, enation - a natural projection or outgrowth from a plant body or organ
Verb	1.	callus - cause a callus to form on; "The long march had callused his feet" harden, indurate - make hard or harder; "The cold hardened the butter"
	2.	callus - form a callus or calluses; "His foot callused" harden, indurate - become hard or harder; "The wax hardened"

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