DIPHENHYDRAMINE Scrabble 30 Words With Friends 31 Definition noun antihistamine (trade name Benadryl) used to treat allergic reactions involving the nasal passages (hay fever) and also to treat motion sickness. — synonyms: Benadryl See all 828 words you can make from DIPHENHYDRAMINE → 15-letter words Words starting with D Words ending with E ← Unscramble different letters