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pyrazoline

[ pi-raz-uh-leen, -lin, pahy- ]
/ pɪˈræz əˌlin, -lɪn, paɪ- /
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noun Chemistry.
any of the group of heterocyclic compounds containing three carbon atoms, two adjacent nitrogen atoms, and one double bond in the ring.
the parent compound, C3H6N2.
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Origin of pyrazoline

First recorded in 1885–90; pyrazole + -ine2
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2022
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