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Any of a class of organic compounds that have a five-membered heterocyclic ring with at least one nitrogen and two double bonds and that also may contain another heteroatom.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
1. (Elements & Compounds) an organic five-membered ring compound containing one or more atoms in the ring, the number usually being specified by a prefix: diazole; triazole.
2. (Elements & Compounds) a less common name for pyrrole
[from azo- + -ole1, on the model of diazole]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
az•ole(ˈæz oʊl, əˈzoʊl)
any of a group of five-membered heterocyclic compounds containing one or more nitrogen atoms in the ring.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.