Source : Webster's Revised Unabridged Dictionary (1913)

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.

Source : WordNet®

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