pyrazoline

[ pi-raz-uh-leen, -lin, pahy- ]

noun

, Chemistry.

1. any of the group of heterocyclic compounds containing three carbon atoms, two adjacent nitrogen atoms, and one double bond in the ring.
2. the parent compound, C 3 H 6 N 2 .

Word History and Origins

Origin of pyrazoline¹

First recorded in 1885–90; pyrazole + -ine ²