WordReference Random House Unabridged Dictionary of American English © 2017
opium pop′py, 
  • Plant Biologya Eurasian poppy, Papaver somniferum, having white, pink, red, or purple flowers, cultivated as the source of opium, for its oily seeds, and as an ornamental.
    • 1860–65

    Collins Concise English Dictionary © HarperCollins Publishers::

    opium poppy n
    1. a poppy, Papaver somniferum, of SW Asia, with greyish-green leaves and typically white or reddish flowers: widely cultivated as a source of opium

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