A hardened area of the skin (especially on the foot or hand) caused by repeated friction, wear or use
A callus (or callous) is an especially toughened area of skin which has become relatively thick and hard as a response to repeated contact or pressure. In botany, the term is also used to announce a condition of thickened surfaces of leaves or other plant parts. Since repeated contact is required, calluses are most often found on hands or feet. Calluses are generally not harmful, but may sometimes lead to other problems, such as infection. Shoes that fit tightly can often produce calluses on the feet. String instrument players develop calluses where their fingers make contact with the strings, but these calluses are often desirable as they help alleviate the pain from the tension of the strings and make playing easier. Dancers often develop calluses on the soles of their feet from dancing barefoot, which makes performing turns less difficult. Video game players may develop calluses on their thumbs, especially if using a controller with a non-ergonomic D-pad design. Frequent use of a writing implement may lead to a callus on the middle finger, commonly known as a "writer's bump"
Parenchymatous cell mass that forms over plant wounds and is commonly seen growing as white, undifferentiated cells from cultured plant cells or tissues
Undifferentiated plant cells resulting from cell division of differentiated organs, such as leaves, roots, seeds The undifferentiated callus can be triggered by hormones to develop into a whole plant
A small area of skin, usually on the foot, that has become thick and hard from rubbing or pressure Calluses may lead to other problems such as serious infection Shoes that fit well can keep calluses from forming See also: Foot care
A hardened area of the skin (especially the foot or hand) caused by repeated wear or use
Corky-texture tissue that forms over a wound on a trunk or branch (e g : a pruned branch)
A cluster of undifferentiated plant cells that have the capacity to regenerate a whole plant in some species