Dictionary![]() ![]() ar•se•nousPronunciation: (är'su-nus), [key] —adj. Chem. 1. containing arsenic in the trivalent state, as arsenous chloride, AsCl3. 2. of or derived from arsenous acid. Also,arsenious. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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