Usually means: Organic compound, five-membered lactam ring.
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We found 7 dictionaries that define the word pyrrolidone:

General (5 matching dictionaries)
  1. pyrrolidone: Merriam-Webster
  2. pyrrolidone: Oxford Learner's Dictionaries
  3. pyrrolidone: Wiktionary
  4. pyrrolidone: Dictionary.com
  5. Pyrrolidone: Wikipedia, the Free Encyclopedia

Computing (1 matching dictionary)
  1. Pyrrolidone: Encyclopedia

Medicine (1 matching dictionary)
  1. online medical dictionary (No longer online)

Definitions from Wiktionary (pyrrolidone)

noun:  (chemistry) any of a class of heterocyclic ketones derived from a pyrrolidine; especially 2-pyrrolidone, the simplest γ-lactam

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