Children's, Intermediate and Advanced Online English Dictionary & Thesaurus

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mustard gas a liquid chemical-warfare agent that causes severe skin burns, damages the lungs, and can cause blindness and death.
mustard plaster a pungent medicinal paste made of powdered mustard and water that is spread on a cloth, steamed, and applied usu. to the chest to relieve congestion.
nitrogen mustard any of a class of poisonous, burning compounds similar to mustard gas, used in treating cancer.
wild mustard charlock or a similar weedy mustard.