Webster's English Dictionary

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hormone

hor.mone \'ho.r-.mo-n\ n [Gk hormo-n, prp. of horman to stir up, fr. horme- 
   impu]lse, assault - more at SERUM 1: a product of living cells that 
   circulates in body fluids or sap and prod uces a specific effect on the 
   activity of cells remote from its point of origin; esp : one exerting a 
   stimulatory effect on a cellular activity 2: a synthetic substance that 
   acts like a hormone