Princeton's WordNet

1. opium(noun)

   an addictive narcotic extracted from seed capsules of the opium poppy

Wiktionary

1. opium(Noun)

   A yellow-brown, addictive narcotic drug obtained from the dried juice of unripe pods of the opium poppy, Papaver somniferum, and containing alkaloids such as morphine, codeine, and papaverine.

2. opium(Noun)

   Anything that numbs or stupefies.

Origin: From opium and , from .

U.S. National Library of Medicine

1. Opium

   The air-dried exudate from the unripe seed capsule of the opium poppy, Papaver somniferum, or its variant, P. album. It contains a number of alkaloids, but only a few - MORPHINE; CODEINE; and PAPAVERINE - have clinical significance. Opium has been used as an analgesic, antitussive, antidiarrheal, and antispasmodic.

The Foolish Dictionary, by Gideon Wurdz

1. OPIUM

   The real author of "The Dream Book."

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