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| a colorless, pungent, suffocating, highly water-soluble, gaseous compound, NH3, usually produced by the combination of nitrogen and hydrogen gases |
| rapid oxidation accompanied by heat and light, or a chemical combination attended by production of heat and light |
pyrazolone py·raz·o·lone (pĭ-rāz'ə-lōn')
n.
A class of nonsteroidal anti-inflammatory agents, such as phenylbutazone, used in the treatment of arthritis.