WordReference Random House Unabridged Dictionary of American English © 2019
di•phen•hy•dra•mine  (dī′fen hīdrə mēn′),USA pronunciation n. [Pharm.]
  1. Drugsa white, crystalline, antihistaminic compound, C17H21NO, used orally, topically, and parenterally, esp. for allergies.
  • diphen(yl) + hydr-2 + amine 1945–50

'diphenhydramine' also found in these entries:
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