noun Chemistry.
- a colorless, crystalline, water-soluble, heterocyclic compound, C3H4N2, used chiefly in organic synthesis.
noun
- Also called: glyoxaline, iminazole a white crystalline basic heterocyclic compound; 1,3-diazole. Formula: C 3 H 4 N 2
- any substituted derivative of this compound
n.
- An organic crystalline base that is an inhibitor of histamine.