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(Pharmacology) trademark an antihistamine drug used in sleeping tablets; diphenhydramine. Formula: C17H21NO
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|Noun||1.||Benadryl - antihistamine (trade name Benadryl) used to treat allergic reactions involving the nasal passages (hay fever) and also to treat motion sickness|
antihistamine - a medicine used to treat allergies and hypersensitive reactions and colds; works by counteracting the effects of histamine on a receptor site