pyrazole

[ pir-uh-zohl, -zawl ]
/ ˈpɪr əˌzoʊl, -ˌzɔl /

noun Chemistry.

any of the group of heterocyclic compounds containing three carbon atoms, two adjacent nitrogen atoms, and two double bonds in the ring.
the parent compound, C3H4N2.

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Origin of pyrazole

First recorded in 1885–90; pyr- + azole
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

British Dictionary definitions for pyrazole

pyrazole
/ (ˈpaɪrəˌzəʊl) /

noun

a crystalline soluble basic heterocyclic compound; 1,2-diazole. Formula: C 3 H 4 N 2

Word Origin for pyrazole

C19: from German, from pyrrole + inserted -az- (see azo-)
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