Noun
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(botany) an isolated thickening of tissue, especially a stiff protuberance on the lip of an orchid
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bony tissue formed during the healing of a fractured bone
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an area of skin that is thick or hard from continual pressure or friction (as the sole of the foot)
Verb
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form a callus or calluses
"His foot callused"
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cause a callus to form on
"The long march had callused his feet"