perspiration

perspiration 1 The secretion of fluid by the sweat (sudoriferous) glands. These small, tubular glands are situated within the skin and in the subcutaneous tissue under it. They discharge fluid through tiny openings in the surface of the skin. Perspiration serves at least two purposes: It removes waste products such as urea and ammonia, and it cools the body as sweat evaporates. 2 The transparent, colorless, acidic fluid that is secreted by the sweat glands. Perspiration contains some fatty acids and mineral matter. Also known as sweat.