The Collaborative International Dictionary of English v.0.48:

Arecoline \A*re"co*line\, n. Also -lin \-lin\ . [From NL. Areca,
   a genus of palms bearing betel nut.]
   An oily liquid substance, C8H13O2N, the chief alkaloid of
   the betel nut, to which the latter owes its anthelmintic
   action.

   Syn: arecholine; arecaline; methylarecaidin; methyl
        N-methyltetrahydronicotinate;
        1,2,5,6-tetrahydro-1-methyl-3-pyridinecarboxylic acid
        methyl ester.
        [Webster 1913 Suppl.]