mus'tard gas"

an oily liquid, C4H8Cl2S, 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.

mustard familymustard oil
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