Definitions for azoleˈæz oʊl, əˈzoʊl
Random House Webster's College Dictionary
az•oleˈæz oʊl, əˈzoʊl(n.)
any of a group of five-membered heterocyclic compounds containing one or more nitrogen atoms in the ring.
Origin of azole:
1895–1900; see azo , -ole2
Any of a class of five-membered unsaturated heterocycles having three carbon atoms, one nitrogen atom and two double bonds
An azole is a class of five-membered nitrogen heterocyclic ring compounds containing at least one other non-carbon atom of either nitrogen, sulfur, or oxygen. The parent compounds are aromatic and have two double bonds; there are successively reduced analogs with fewer. One, and only one, lone pair of electrons from each heteroatom in the ring is part of the aromatic bonding in an azole. Names of azoles maintain the prefix upon reduction. The numbering of ring atoms in azoles starts with the heteroatom that is not part of a double bond, and then proceeds towards the other heteroatom.