• synonyms

arsenous acid

noun Chemistry.
  1. a hypothetical acid, H3AsO3 or HAsO2, found only in solution or in the form of its salts.
  2. arsenic trioxide.
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Origin of arsenous acid

First recorded in 1790–1800
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018