/duy fos"jeen/ , n. Chem.
a colorless liquid, C 2 Cl 4 O 2 , usually derived from methyl formate or methyl chloroformate by chlorination: a World War I poison gas now used chiefly in organic synthesis. Also called trichloromethyl chloroformate .
[ 1920-25; DI- 1 + PHOSGENE ]