carbodiimide
/ˌkɑːbə(ʊ)dʌɪˈɪmʌɪd/Chemistry
noun
Originally: the compound HN=C=NH, a tautomeric form of cyanamide (now rare ). In later use: any of a class of compounds having the general formula RN=C=NR′, characterized by a carbon atom doubly bonded to two nitrogen atoms each bearing an organic group.
Origin
Late 19th century; earliest use found in Henry Watts (1815–1884), chemist. From carbo- + di- + imide, after German Carbodiimid.