Dictionaryke•tenePronunciation: (kē'tēn), [key] —n. Chem. a colorless, poisonous gas, C2H2O, irritating to the lungs, prepared from acetone or acetic acid by pyrolysis: used chiefly in the manufacture of certain commercial chemicals, as acetic anhydride and aspirin. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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