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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