Wiktionary
carbodiimide
n. (context chemistry English) the compound HN=C=NH, or any of its hydrocarbyl derivatives
Wikipedia
Carbodiimide
A carbodiimide or a methanediimine is a functional group consisting of the formula RN=C=NR. Carbodiimides hydrolyze to form ureas, which makes them uncommon in nature. From the perspective of small molecule activation, carbodiimides are isoelectronic with carbon dioxide.