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Meaning of arsenous

ar•se•nous

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