Diphosgene meaning

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A colorless liquid, C2 Cl4 O2 , used in organic synthesis. Its vapor was used as a poison gas in World War I.
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A poisonous, liquid compound, ClCO2CCl3, related to phosgene and used as a lung-irritant gas in chemical warfare.
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(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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