aldicarb Syllabification: (al·di·carb)Pronunciation: /ˈaldiˌkärb/Definition of aldicarb noun a systemic agricultural pesticide used particularly against some mites, insects, and nematode worms. Origin: 1970s: blend of aldehyde and carbamide (from carbo- + amide)aldicarb in other Oxford dictionaries Definition of aldicarb in the British & World English dictionary