Definition of lewisite in English:



mass noun
  • A dark oily liquid producing an irritant gas that causes blisters, developed for use in chemical warfare.

    An organic compound of arsenic; chemical formula: ClCHCHAsCl₂

    • ‘Among the CW agents produced were phosgene, mustard, lewisite, hydrogen cyanide, and diphenyl cyanarsine.’
    • ‘The chemicals, confiscated from Hitler's Third Reich at the end of the second world war, were mustard gas, phosgene, tabun and lewisite, all of which can inflict appalling injuries.’
    • ‘This target list usually included sarin, soman, mustard, lewisite, cyclosarin, and fats, oils and wax to name a few.’


1920s: named after Winford L. Lewis (1878–1943), American chemist.