–noun1.the external covering or integument of an animal body, esp. when soft and flexible.
2.such an integument stripped from the body of an animal, esp. a small animal; pelt: a beaver skin.
3.the tanned or treated pelt or hide of an animal, esp. when used in apparel and accessories; leather (usually used in combination): pigskin; calfskin.
4.any integumentary covering, casing, outer coating, or surface layer, as an investing membrane, the rind or peel of fruit, or a film on liquid: a skin of thin ice; the aluminum skin of an airplane.
5.Jewelry. a.the outermost layer of a pearl.
b.the outermost layer of a diamond as found: often different in color and refraction from the inner part of the stone.
6.Nautical. a.the shell or ceiling of a hull.
b.the outer, exposed part of a furled sail.
7.Metallurgy. an outer layer of a metal piece having characteristics differing from those of the interior.