cytisine
noun
cyt·i·sine
| \ ˈsit-ə-ˌsēn
, -sən
\
, -sən
\
Medical Definition of cytisine
: a bitter crystalline very poisonous alkaloid C11H14N2O found in many plants of the family Leguminosae and formerly used as a cathartic and diuretic
— called also sophorine