ˌkamptəˈthēsə̇n noun
( -s )
Etymology: New Latin Camptotheca , genus name (from campto- + -theca ) + English -in
: an alkaloid C 20 H 16 N 2 O 4 from the wood of a Chinese tree ( Camptotheca acuminata ) of the family Nyssaceae that has shown some antileukemic and antitumor activity in animal studies ; also : a semisynthetic or synthetic derivative of this