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diphenhydramine

[dahy-fen-hahy-druh-meen]
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noun Pharmacology.
  1. a white, crystalline, antihistaminic compound, C17H21NO, used orally, topically, and parenterally, especially for allergies.
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Origin of diphenhydramine

First recorded in 1945–50; diphen(yl) + hydr-2 + amine
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018