n. A heterocyclic organic compound containing two nitrogen atoms separated by a carbon atom in a five-membered ring, called 1,3-diazole in IUPAC nomenclature.
n. A group of compounds containing that structure.
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n. an organic base C3H4N2; a histamine inhibitor
Word Usage
"The dark blue copper ion is bonded in a cavity between two imidazole groups (the five-membered rings) and two yellow sulphur atoms."