Breadcrumb Home > Thesaurus > D Synonyms of diphenhydramine Find synonyms for: Noun 1. diphenhydramine, Benadryl, antihistamine usage: antihistamine (trade name Benadryl) used to treat allergic reactions involving the nasal passages (hay fever) and also to treat motion sickness WordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved.Definition and meaning of diphenhydramine (Dictionary) TrendingHere are the facts and trivia that people are buzzing about. Chinese New Year History, Meaning, and Celebrations Current Events This Week: February 2024 Valentine's Day Valentine's Day History Mardi Gras 30 "Charlie and the Chocolate Factory" Quotes ✖ Related Content Daily Word Quiz: procellous Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language