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[pi-raz-uh-lohn, pahy-]
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noun Chemistry.
  1. any of the group of heterocyclic compounds containing the pyrazoline ring in which one carbon atom is doubly linked to an oxygen atom not in the ring.
  2. the parent compound, C3H4N2O.

Origin of pyrazolone

First recorded in 1885–90; pyrazole + -one
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
pyrazolone in Medicine


  1. A class of nonsteroidal anti-inflammatory agents, such as phenylbutazone, used in the treatment of arthritis.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.