any of a group of organic compounds containing three carbon atoms and two nitrogen atoms arranged in a ring.
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British Dictionary definitions for diazole
any organic compound whose molecules contain a pentagonal ring of three carbon atoms and two nitrogen atoms, esp imidazole (1,3-diazole) or pyrazole (1,1–diazole)
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012