butyrolactone
noun
bu·tyr·o·lactone
| \ ¦byütə(ˌ)rō, -ərə +\
plural -s
Definition of butyrolactone
: a mobile liquid lactone C4H6O2 made usually by dehydrogenation of 1,4-butanediol and used chiefly as a solvent for resins (such as polymers of acrylonitrile)
— called also butanolide
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