diphenhydramine

/ˌdaɪfɛnˈhaɪdrəˌmin/
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Definitions of diphenhydramine
  1. noun
    antihistamine (trade name Benadryl) used to treat allergic reactions involving the nasal passages (hay fever) and also to treat motion sickness
    synonyms: Benadryl
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    type of:
    antihistamine
    a medicine used to treat allergies and hypersensitive reactions and colds; works by counteracting the effects of histamine on a receptor site
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