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Medical Definition Definition Entries Near Cite this EntryCitation To save this word, you'll need to log in. Log In DPA abbreviation diphenylamine Browse Nearby Words DP DPA DPH See all Nearby Words Cite this Entry Style “DPA.” Merriam-Webster.com Medical Dictionary, Merriam-Webster, https://www.merriam-webster.com/medical/DPA. Accessed 11 Nov. 2026. Copy Citation Love words? Need even more definitions? Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free! Merriam-Webster unabridged More from Merriam-Webster Can you solve 4 words at once? Can you solve 4 words at once? Word of the Day valorous See Definitions and Examples » Get Word of the Day daily email! Popular in Grammar & Usage See More How to Use 'Who' vs. 'Whom' 31 Useful Rhetorical Devices More Commonly Misspelled Words Merriam-Webster’s Great Big List of Words You Love to Hate 'Affect' vs. 'Effect' See More Popular in Wordplay See More Great Big List of Beautiful and Useless Words, Vol. 5 9 Words That Sound Like Insults But Aren't The Longest Long Words List Even More Bird Names that Sound Like Insults (and Sometimes Are) 12 Lovely and Unusual Words for the Natural World See More Popular See More How to Use 'Who' vs. 'Whom' Great Big List of Beautiful and Useless Words, Vol. 5 9 Words That Sound Like Insults But Aren't See More Games & Quizzes See All Quordle Can you solve 4 words at once? Blossom Pick the best words! The Missing Letter A daily crossword with a twist Famous Novels, Last Lines Quiz Needless to say, spoiler alert. See All Information from your device can be used to personalize your ad experience. Do not sell or share my personal information.