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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.
GCIDE(2.00 / 1 vote)Rate this definition: 1  Hormone(n.) (Physiological Chem.) a chemical substance, whether natural or synthetic, that functions like a hormone in a living organism. 2  Hormone(n.) (Bot.) A substance that controls growth rate or differentiation in plants; also called phytohormone.