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, C3H6N2.

Origin of pyrazoline

First recorded in 1885–90; pyrazole + -ine2
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018