lewisite

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1. a pale yellow, odorless compound, C2H2AsCl3, used as a blister gas in World War I.

noun

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:CHAsCl 2

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