pyrrolidone
noun
pyr·rol·idone
| \ -dōn\
plural -s
Definition of pyrrolidone
: a crystalline or liquid lactam C4H7NO made by a series of steps using acetylene, formaldehyde, and ammonia and used chiefly in making polyvinylpyrrolidone; 2-pyrrolidin-one
— called also 2-pyrrolidone
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