Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun A colorless liquid, C2Cl4O2, used in organic synthesis. Its vapor was used as a poison gas in World War I.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun organic chemistry The highly chlorinated ester trichloromethyl chloroformate that is used in organic synthesis, and was once used as a military poison

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