[1] : The Collaborative International Dictionary of English v.0.48

cannabis \can"nabis\, prop. n. l., hemp. see canvas.
   1. bot. a genus of a single species belonging to the order
      uricaceae; 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
see also:
canvas uricaceae cannabis sativa cannabis indica tetrahydrocannabinol 

[2] : WordNet (r) 2.0

cannabis
     n 1: any plant of the genus cannabis; a coarse bushy annual with
          palmate leaves and clusters of small green flowers;
          yields tough fibers and narcotic drugs syn: hemp
     2: the most commonly used illicit drug; considered a soft drug,
        it consists of the dried leaves of the hemp plant; smoked
        or chewed for euphoric effect syn: marijuana, marihuana,
         ganja
see also:
hemp marijuana marihuana ganja 

Cannabis >> C Words
Cannabis, definition of term: Cannabis
cannabis_pag1.html

Cannabis Sativa >> C Words
Cannabis Sativa, definition of term: Cannabis Sativa
cannabis+sativa_pag1.html