Noun: diphenhydramine ,dI-fen'hI-dru,meen
- Antihistamine (trade name Benadryl) used to treat allergic reactions involving the nasal passages (hay fever) and also to treat motion sickness
"She took diphenhydramine to relieve her allergy symptoms";
- Benadryl
Derived forms: diphenhydramines
Type of: antihistamine
Encyclopedia: Diphenhydramine