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[ahr-suh-nuh s]
See more synonyms for arsenous on Thesaurus.com
adjective Chemistry.
  1. containing arsenic in the trivalent state, as arsenous chloride, AsCl3.
  2. 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