Dictionary
mus'tard gas"
an oily liquid, C
4H
8Cl
2S, used as a chemical-warfare gas, blistering the skin and damaging the lungs, often causing blindness and death: introduced by the Germans in World War I. Also called
dichlorodiethyl sulfide. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.