scam·mo·ny 
(skămə-nē)
(skămə-nē)n. pl. scam·mo·nies
1.
a. An eastern Mediterranean plant (Convolvulus scammonia) having large roots that yield a resin formerly used as a cathartic.
b. A Mexican plant (Ipomoea orizabensis) yielding a similar resin.
2. A cathartic preparation obtained from these resins.
[Middle English scamonie, from Old English scammōniam and from Old French scamonie, both from Latin scammōnea, from Greek skammōniā.]