Pyrazole
The Century Dictionary and Cyclopedia
noun.
A crystalline base, , made by heating pyrazole di- or tricarbonic acid. It melts at 70° C.
Wiktionary, Creative Commons Attribution/Share-Alike License
noun.
A
heterocyclic
organic compound
containing two
nitrogen
atoms next to each others in a five-membered ring, called 1,2-diazole in IUPAC nomenclature.
noun.
A group of compounds containing that
structure
.
cross-reference
imidazole