skin

Definition

noun
  • the tissue which forms the outside surface of the body
    Examples His skin turned brown in the sun. • Skin problems in adolescents may be caused by diet.
    (Note For other terms referring to skin, see words beginning with cut-, derm-, derma-, dermato-, dermo-.)
COMMENT The skin is the largest organ in the human body. It is formed of two layers: the epidermis is the outer layer, and includes the top layer of particles of dead skin which are continuously flaking off. Beneath the epidermis is the dermis, which is the main layer of living skin. Hairs and nails are produced by the skin, and pores in the skin secrete sweat from the sweat glands underneath the dermis. The skin is sensitive to touch and heat and cold, which are sensed by the nerve endings in the skin. The skin is a major source of vitamin D which it produces when exposed to sunlight.
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