WordReference Random House Unabridged Dictionary of American English © 2019
2,4-D  (to̅o̅fôr, fōr-).USA pronunciation 
  • See  dichlorophenoxyacetic acid. 

  • Collins Concise English Dictionary © HarperCollins Publishers::
    2,4-D n
    1. a synthetic auxin widely used as a weedkiller; 2,4-dichlorophenoxyacetic acid
    '2,4-D' also found in these entries:
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