1. A colorless, oily liquid chemical compound (trichloromethyl chloroformate) used as a chemical warfare agent and in industrial synthesis; similar in effect to phosgene but more persistent.
Usage: technical; chemistry; military/historical context

Examples

• Diphosgene was developed as a chemical weapon during World War I.
• The compound diphosgene is more stable than phosgene in storage.
• Military historians study diphosgene as part of chemical warfare research.
• Diphosgene can be used in organic synthesis for creating certain esters and carbonates.
• Exposure to diphosgene causes severe respiratory damage similar to phosgene poisoning.