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pyrazolone

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noun py·raz·o·lone \-ˌlōn\

Medical Definition of pyrazolone

  1. 1:  any of three isomeric carbonyl compounds C3H4N2O derived from pyrazoline

  2. 2:  any of various derivatives of the pyrazolones some of which (as antipyrine) have been used as analgesics and antipyretics

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