A hardened area of the skin (especially on the foot or hand) caused by repeated friction, wear or use.
A shining area on the frons of many species of Tabanomorpha (horse flies and relatives).
The material of repair in fractures of bone; a substance exuded at the site of fracture, which is at first soft or cartilaginous in consistency, but is ultimately converted into true bone and unites the fragments into a single piece.
The new formation over the end of a cutting, before it puts out rootlets.
To form such hardened tissue.
A type of deformed growth occurring on the skin caused by the human papillomavirus (HPV).
Any of the prefixes used in Hungarian notation.
Any similar growth occurring in plants or animals, such as the parotoid glands in the back of toads.