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[loo-uh-sahyt] /ˈlu əˌsaɪt/
a pale yellow, odorless compound, C 2 H 2 AsCl 3 , used as a blister gas in World War I.
Origin of lewisite
1920-25; named after Winford Lee Lewis (1878-1943), American chemist who developed it; see -ite1 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for lewisite
  • Information on lewisite, a potential agent for chemical terrorism.
  • lewisite, a chemical warfare agent containing arsenic, was manufactured in four of the plants.
  • Wastes generated from lewisite manufacturing were disposed in shallow surface impoundments.
  • The non-stockpile section of the agency may be tasked to destroy the lewisite at some point in the future.
British Dictionary definitions for lewisite


a colourless oily poisonous liquid with an odour resembling that of geraniums, having a powerful vesicant action and used as a war gas; 1-chloro-2-dichloroarsinoethene. Formula: ClCH:CHAsCl2
Word Origin
C20: named after W. L. Lewis (1878–1943), US chemist
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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