Source : Webster's Revised Unabridged Dictionary (1913)

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

   {Cannabis Indica}, the Indian hemp, a powerful narcotic, now
      considered a variety of the common hemp.

Source : WordNet®

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}]