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We found 20 dictionaries with English definitions that include the word diphenhydramine: Click on the first link on a line below to go directly to a page where "diphenhydramine" is defined. General (13 matching dictionaries) diphenhydramine: Collins English Dictionary [home, info] diphenhydramine: Vocabulary.com [home, info] diphenhydramine: Merriam-Webster's Online Dictionary, 11th Edition [home, info] Diphenhydramine, diphenhydramine: Wordnik [home, info] diphenhydramine: Wiktionary [home, info] diphenhydramine: Infoplease Dictionary [home, info] diphenhydramine: Dictionary.com [home, info] Diphenhydramine: Wikipedia, the Free Encyclopedia [home, info] diphenhydramine: Rhymezone [home, info] diphenhydramine: Free Dictionary [home, info] diphenhydramine: Mnemonic Dictionary [home, info] diphenhydramine: LookWAYup Translating Dictionary/Thesaurus [home, info] diphenhydramine: Dictionary/thesaurus [home, info] Medicine (7 matching dictionaries) Diphenhydramine: Medical Dictionary [home, info] Diphenhydramine: Merck Manuals [home, info] diphenhydramine: online medical dictionary [home, info] Diphenhydramine: Allergy Glossary [home, info] diphenhydramine: Dictionary of Cancer Terms [home, info] generic/dihydram.htm">Diphenhydramine: RxList The Internet Drug Index [home, info] diphenhydramine: Medical dictionary [home, info]

Quick definitions from WordNet (diphenhydramine) ▸ noun:  antihistamine (trade name Benadryl) used to treat allergic reactions involving the nasal passages (hay fever) and also to treat motion sickness