[nux vom.i.ca] n, pl nux vomica [NL, lit., emetic nut] (14c) 1: the poisonous seed of an Asian tree (Strychnos nux-vomica of the family Loganiaceae) that contains several alkaloids and esp. strychnine and brucine; also: the tree yielding nux vomica
2: a drug containing nux vomica