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pyrazole

[pir-uh-zohl, -zawl] /ˈpɪr əˌzoʊl, -ˌzɔl/
noun, Chemistry
1.
any of the group of heterocyclic compounds containing three carbon atoms, two adjacent nitrogen atoms, and two double bonds in the ring.
2.
the parent compound, C 3 H 4 N 2 .
Origin
1885-1890
1885-90; pyr- + azole
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for pyrazole

pyrazole

/ˈpaɪrəˌzəʊl/
noun
1.
a crystalline soluble basic heterocyclic compound; 1,2-diazole. Formula: C3H4N2
Word Origin
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
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Encyclopedia Article for pyrazole

any of a class of organic compounds of the heterocyclic series characterized by a ring structure composed of three carbon atoms and two nitrogen atoms in adjacent positions. The simplest member of the pyrazole family is pyrazole itself, a compound with molecular formula C3H4N2.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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