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Hormone definition, Biochemistry. any of various internally secreted compounds, as insulin or thyroxine, formed in endocrine glands, that affect the functions of specifically receptive organs or tissues when transported to them by the body fluids. Pharmacology. a synthetic substance used in medicine to act like such a compound when introduced into the body.
Full Definition of HORMONE. 1. : a product of living cells that circulates in body fluids (as blood) or sap and produces a specific often stimulatory effect on the activity of cells usually remote from its point of origin; also: a synthetic substance that acts like a hormone.2.: sex hormone. â horÂ·moneÂ·like \-ËlÄ«k\ adjective.. : a product of living cells that circulates in body fluids (as blood) or sap and produces a specific often stimulatory effect on the activity of cells usually remote from its point of origin; also: a synthetic substance that acts like a hormone. 2. : sex hormone. â horÂ·moneÂ·like \-ËlÄ«k\ adjective.