pyrazole
/ˈpʌɪrəzəʊl/ /ˈpɪrəzəʊl/Chemistry
noun
A weakly basic, crystalline, heterocyclic compound whose molecule is an unsaturated five-membered ring containing adjacent nitrogen atoms; any substituted derivative of this compound.
- Formula: CH=CH—CH=N—NH..
Origin
Late 19th century; earliest use found in Journal of the Chemical Society. From German Pyrazol from pyr- (in Pyrrol) + azo- + -ol.