WordReference Random House Learner's Dictionary of American English © 2017
o•pi•um /ˈoʊpiəm/USA pronunciation   n. [uncountable]
  1. Drugs, Plant Biologya narcotic drug made from the dried, condensed juice of the seed capsules of a poppy.
  2. opiate (def. 3).

WordReference Random House Unabridged Dictionary of American English © 2017
o•pi•um  pē əm),USA pronunciation n. 
  1. Drugs, Plant Biologythe dried, condensed juice of a poppy, Papaver somniferum, that has a narcotic, soporific, analgesic, and astringent effect and contains morphine, codeine, papaverine, and other alkaloids used in medicine in their isolated or derived forms: a narcotic substance, poisonous in large doses.
  2. anything that causes dullness or inaction or that soothes the mind or emotions.
  • Greek ópion poppy juice, equivalent. to op(ós) sap, juice + -ion diminutive suffix
  • Latin
  • Middle English 1350–1400

Collins Concise English Dictionary © HarperCollins Publishers::

opium /ˈəʊpɪəm/ n
  1. the dried juice extracted from the unripe seed capsules of the opium poppy that contains alkaloids such as morphine and codeine: used in medicine as an analgesic
  2. something having a tranquillizing or stupefying effect
Etymology: 14th Century: from Latin: poppy juice, from Greek opion, diminutive of opos juice of a plant

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