From The Collaborative International Dictionary of English v.0.48:

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
        [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]

From The Collaborative International Dictionary of English v.0.48:

Hemp \Hemp\ (h[e^]mp), n. [OE. hemp, AS. henep, h[ae]nep; akin
   to D. hennep, OHG. hanaf, G. hanf, Icel. hampr, Dan. hamp,
   Sw. hampa, L. cannabis, cannabum, Gr. ka`nnabis, ka`nnabos;
   cf. Russ. konoplia, Skr. [,c]a[.n]a; all prob. borrowed from
   some other language at an early time. Cf. Cannabine,
   1. (Bot.) A plant of the genus Cannabis ({Cannabis
      sativa}), the fibrous skin or bark of which is used for
      making cloth and cordage. The name is also applied to
      various other plants yielding fiber.
      [1913 Webster]

   2. The fiber of the skin or rind of the plant, prepared for
      spinning. The name has also been extended to various
      fibers resembling the true hemp.
      [1913 Webster]

   African hemp, Bowstring hemp. See under African, and

   Bastard hemp, the Asiatic herb Datisca cannabina.

   Canada hemp, a species of dogbane (Apocynum cannabinum),
      the fiber of which was used by the Indians.

   Hemp agrimony, a coarse, composite herb of Europe
      (Eupatorium cannabinum), much like the American boneset.

   Hemp nettle, a plant of the genus Galeopsis ({Galeopsis
      Tetrahit}), belonging to the Mint family.

   Indian hemp. See under Indian, a.

   Manila hemp, the fiber of Musa textilis.

   Sisal hemp, the fiber of Agave sisalana, of Mexico and

   Sunn hemp, a fiber obtained from a leguminous plant
      (Crotalaria juncea).

   Water hemp, an annual American weed (Acnida cannabina),
      related to the amaranth.
      [1913 Webster]
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