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



BrE BrE//ˈhɪstəmiːn//
; NAmE NAmE//ˈhɪstəmiːn//
[uncountable] (medical)
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a chemical substance that is given out in the body in response to an injury or an allergy see also antihistamine Word Origin early 20th cent.: blend of histidine and amine.
See the Oxford Advanced American Dictionary entry: histamine