Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. A pungent, toxic, colorless gas, C2H2O, used chiefly as an acetylation agent.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. any of a class of unsaturated ketones, having a general formula R1R2C=C=O, that react as if they were inner acid anhydrides
  • n. the parent compound of this class, CH2=C=O, an unstable, reactive colourless gas

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