kəˈne(ˌ)sēn, -nesə̇n noun
( -s )
Etymology: International Scientific Vocabulary conessi (bark) + -ine
: a very bitter poisonous crystalline alkaloid C 24 H 40 N 2 obtained from certain tropical trees of the family Apocynaceae (especially Holarrhena antidysenterica and Wrightia zeylandica )