callus

nouns

an area of skin that is thick or hard from continual pressure or friction (as the sole of the foot)
callosity, callus
bony tissue formed during the healing of a fractured bone
callus
is a type of (narrower)
a mark left (usually on the skin) by the healing of injured tissue
cicatrice, cicatrix, scar
(botany) an isolated thickening of tissue, especially a stiff protuberance on the lip of an orchid
callus
domain category
the branch of biology that studies plants
botany, phytology
is a type of (narrower)
a natural projection or outgrowth from a plant body or organ
enation, plant process

verbs

cause a callus to form on
"The long march had callused his feet"
callus
is a type of (narrower)
make hard or harder
"The cold hardened the butter"
harden, indurate
form a callus or calluses
"His foot callused"
callus
is a type of (narrower)
become hard or harder
"The wax hardened"
harden, indurate