arsenous

[ahr-suh-nuh s]

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adjective Chemistry.

containing arsenic in the trivalent state, as arsenous chloride, AsCl3.
of or derived from arsenous acid.

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Also arsenious.

Origin of arsenous

First recorded in 1790–1800; arsen- + -ous

Can be confusedarsenous arsonous

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018