Definition of pyridazine in US English:

pyridazine

noun

Chemistry
  • A weakly basic, liquid, heteroaromatic compound which is a diazine with the nitrogen atoms at adjacent positions in the ring; any substituted derivative of this compound.

Origin

Late 19th century; earliest use found in Henry Forster Morley (b. 1855). From German Pyridazin from pyrid- (in Pyridin) + -azin, after -pyridazin-.

Pronunciation

pyridazine

/pɪˈrɪdəziːn/