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The Collaborative International Dictionary of English v.0.48 (gcide)

marijuana \marijuana\ n.
1. A strong-smelling Asian plant ({Cannabis sativa}), also
called {hemp}, from which a number of euphorogenic and
halucinogenic drugs are prepared. The euphoric effect is
predominently due to {tetrahydrocannabinol} ({THC}). [Also
spelled {marihuana}.]

Syn: cannabis, ganja, pot, grass, marihuana, {Cannabis
sativa}.
[WordNet 1.5]

2. The dried leaves or the female flowers of the hemp plant,
which is smoked or chewed to obtain a euphoric effect. The
flowers usually have a higher concentration of the active
ingredient, tetrahydrocannabinol.

Syn: cannabis, ganja, pot, grass, marihuana, dope, weed,
gage, sess, sens, smoke, skunk, Mary Jane.
[WordNet 1.5]