from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun A pungent, toxic, colorless gas, C2H2O, used chiefly as an acetylation agent.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun organic chemistry any of a
classof unsaturated ketones, having a general formulaR1R2C=C=O, that react as if they were inner acid anhydrides
- noun organic chemistry the
parent compoundof this class, CH2=C=O, an unstable, reactive colourless gas
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