Source : Webster's Revised Unabridged Dictionary (1913)

Ganja \Gan"ja\, n. [Hind. g[=a]njh[=a].]
   The dried hemp plant, used in India for smoking. It is
   extremely narcotic and intoxicating.

Source : WordNet®

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