cannabin

from WordNet (r) 3.0 (2006)

cannabin
    n 1: a resin obtained from the hemp plant; thought to be the
         active narcotic agent in marijuana [syn: {cannabin},
         {cannabis resin}]

from 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]