UK:*UK and possibly other pronunciationsUK and possibly other pronunciations/ˈluːɪˌsaɪt/US:USA pronunciation: respellingUSA pronunciation: respelling(lo̅o̅ə sīt′)

WordReference Random House Unabridged Dictionary of American English © 2020
lew•is•ite  (lo̅o̅ə sīt′),USA pronunciation n. 
  1. Chemistrya pale yellow, odorless compound, C2H2AsCl3, used as a blister gas in World War I.
  • 1920–25; named after Winford Lee Lewis (1878–1943), American chemist who developed it; see -ite1

Collins Concise English Dictionary © HarperCollins Publishers::
lewisite /ˈluːɪˌsaɪt/ n
  1. 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
Etymology: 20th Century: named after W. L. Lewis (1878–1943), US chemist
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