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Definition of hormone noun from the Oxford Advanced Learner's Dictionary

 

hormone

 noun
noun
BrE BrE//ˈhɔːməʊn//
 
; NAmE NAmE//ˈhɔːrmoʊn//
 
 
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a chemical substance produced in the body or in a plant that encourages growth or influences how the cells and tissues function; an artificial substance that has similar effects growth hormones a hormone imbalance Oestrogen is a female sex hormone. children who do not produce enough growth hormone Word Origin early 20th cent.: from Greek hormōn, present participle of horman ‘impel, set in motion’.
See the Oxford Advanced American Dictionary entry: hormone

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