any of several organic chemicals having a chlorinated methylene group bonded to two carbon atoms of a 6-membered carbon ring, used commercially in insecticides.
Main Entry: cy·clo·di·ene Pronunciation: -'dI-"En, -dI-' Function: noun : an organic insecticide (as aldrin, dieldrin, or chlordane)with a chlorinated methylene group forming a bridge across a 6-membered carbon ring
[sahy-kluh-dahy-een, -dahy-een] 
kləˈdaɪ