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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.
LINK / CITE ADD TO WORD LIST. noun. The definition of a hormone is a substance formed in an organ or tissue in the body of a plant or animal and then transported by body fluid to another organ or tissue for a specific action.An example of a hormone is estrogen in humans. substance, usually a peptide or steroid, produced by one tissue and conveyed by the bloodstream to another to effect physiological activity, such as growth or metabolism. b. A synthetic compound that acts like a hormone in the body.