1 definition found From The Collaborative International Dictionary of English v.0.48 [gcide]: Hormone \Hor"mone\ (h[^o]r"m[=o]n), n. [From Gr. "orma`ein to excite.] 1. (Physiological Chem.) A chemical substance formed in one organ and carried in the circulation to another organ on which it exerts a specific effect on cells at a distance from the producing cells; thus, pituitary hormones produced in the brain may have effects on cells in distant parts of the body.. [Webster 1913 Suppl. +PJC] 2. (Physiological Chem.) a chemical substance, whether natural or synthetic, that functions like a hormone in a living organism. Thus, synthetic steroid hormones may be more effective than their natural counterparts. [PJC] 3. (Bot.) A substance that controls growth rate or differentiation in plants; also called {phytohormone}. The most well-known are the {auxins} that stimulate growth at the growing tips of plants, and control root formation and the dropping of leaves; and the {gibberellins}, which are used in agriculture to promote plant growth. [PJC]
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