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n 1  :  a product of living cells that circulates in body fluids or sap and produces a specific effect on the activity of cells remote from its point of origin : esp  :  one exerting a stimulatory effect on a cellular activity - called also internal secretion  - see PLANT HORMONE   2  :  a synthetic substance that acts like a hormone hor*mone*like adj 
Similar sounding terms:  har·mine 

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