From Longman Dictionary of Contemporary Englishmustard gasˈmustard gas noun [uncountable] PMWa poisonous gas that burns the skin, first used during the First World War
Examples from the Corpus
mustard gas• It was called mustard gas and was used at Ypres in 1917, when it caused many thousands of casualties.• The leaves of cabbages, mustard and some other brassicas contain toxic mustard oil, similar to the deadly mustard gas.• Four kids to rear and a husband coughing away his lungs from mustard gas.• The world greeted the news as if President Tucker had reintroduced mustard gas.• Gene mutations occur spontaneously and can be induced by mutagenic agents such has high temperature, mustard gas, and radiation. 