physostigmine

from WordNet (r) 3.0 (2006)

physostigmine
    n 1: used in treatment of Alzheimer's disease and glaucoma

from The Collaborative International Dictionary of English v.0.48

Physostigmine \Phy`so*stig"mine\, n. (Chem.)
   An alkaloid found in the Calabar bean (the seed of
   {Physostigma venenosum}), and extracted as a white,
   tasteless, substance, amorphous or crystalline; -- formerly
   called {eserine}, with which it was regarded as identical.
   [1913 Webster]