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secretion se·cre·tion (sĭ-krē'shən)
The process of secreting a substance from a cell or gland.
A substance, such as saliva, mucus, tears, bile, or a hormone, that is secreted.
in biology, production and release of a useful substance by a gland or cell; also, the substance produced. In addition to the enzymes and hormones that facilitate and regulate complex biochemical processes, body tissues also secrete a variety of substances that provide lubrication and moisture. Within an individual cell the Golgi apparatus and its associated secretory granules are thought to be the structures responsible for the production and release of secretory substances.