A highly toxic chemical agent that causes severe skin blistering and eye damage; pure forms are colorless oily liquids with an odor resembling mustard or garlic.

a highly toxic chemical gas used as a weapon, specifically dichlorodiethyl sulfide; also called [[芥子气|芥子氣|jie4 zi3 qi4]]

a medical plaster made of mustard-powder paste, traditionally used to increase blood flow