The Collaborative International Dictionary of English v.0.48:

Hasheesh \Hash"eesh\ Hashish \Hash"ish\ (h[a^]sh"[=e]sh), n.
   [Ar. hash[imac]sh.]
   A slightly acrid gum resin produced by the common hemp
   (Cannabis sativa), of the variety Indica, when cultivated
   in a warm climate; also, the tops of the plant, from which
   the resinous product is obtained. It is narcotic, and has
   long been used in the East for its intoxicating effect. The
   active psychoactive principle has been identified as
   tetrahydrocannabinol. See Bhang, and Ganja.

   Syn: hash.
        [1913 Webster +PJC]

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
        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]

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,
   Canvas.]
   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
      Bowstring.

   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
      Yucatan.

   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]

The Collaborative International Dictionary of English v.0.48:

Cannabin \Can"na*bin\, n. (Chem.)
   A poisonous resin extracted from hemp (Cannabis sativa,
   variety Indica). The euphoric and narcotic effects of
   hasheesh are due to this resin; the active ingredient is
   tetrahydrocannabinol, THC. See Cannabis Indica, below.
   [1913 Webster +PJC]

The Collaborative International Dictionary of English v.0.48:

Cannabis \Can"na*bis\, prop. n. [L., hemp. See Canvas.]
   1. (Bot.) A genus of a single species belonging to the order
      Uricace[ae]; hemp.
      [1913 Webster]

   2. The Indian hemp plant plant Cannabis sativa syn.
      Cannabis Indica. See Cannabis Indica, below.
      [PJC]

   Cannabis Indica, the Indian hemp, now considered a variety
      of the common hemp (Cannabis sativa), originating in
      Asia but now grown widely around the world. It can be
      formed into a tough fiber that is used to make rope and
      tough fabric. The dried leaves and female flowers are
      smoked or chewed by people to produce a euphoric or
      hallucinogenic effect, caused mainly by the substance
      tetrahydrocannabinol (THC) contained in it. The
      THC-containing products of Cannabis are classified as a
      controlled substance, and posession and sale are illegal
      in most states of the United States. Once classified as a
      narcotic, the plant is now more commonly referred to in
      the category of euphoric or hallucinogenic agents.
      [1913 Webster +PJC]

The Collaborative International Dictionary of English v.0.48:

Charras \Char"ras\, n.
   The gum resin of the hemp plant (Cannabis sativa). Same as
   Churrus. --Balfour.
   [1913 Webster]

WordNet (r) 3.0 (2006):

Cannabis sativa
    n 1: a strong-smelling plant from whose dried leaves a number of
         euphoriant and hallucinogenic drugs are prepared [syn:
         marijuana, marihuana, ganja, Cannabis sativa]