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phosphorous acid

noun

Chemistry.
  1. a colorless, crystalline, water-soluble acid of phosphorus, H 3 PO 3 , from which phosphites are derived.



phosphorous acid

noun

  1. Systematic name: phosphoric acidAlso called: orthophosphorous acida white or yellowish hygroscopic crystalline dibasic acid. Formula: H 3 PO 3

  2. any oxyacid of phosphorus containing less oxygen than the corresponding phosphoric acid

“Collins English Dictionary — Complete & Unabridged” 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

phosphorous acid

  1. A white or yellowish crystalline solid used as a reducing agent. It is hygroscopic (easily absorbs moisture from the atmosphere). Chemical formula: H 3 PO 3 .

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Word History and Origins

Origin of phosphorous acid1

First recorded in 1785–95
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Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

The white fumes of phosphorous acid floated out into the air, and began to diffuse themselves through the hall towards the ventilation outlets at the sides and rear.

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I distilled two parts of finely pulverised manganese with one part of the phosphorous acid of urine in the same way as is indicated in the preceding paragraph, I likewise obtained fire-air.

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The important acids of phosphorus are the following: H3PO3 phosphorous acid.

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Bodies absorbing oxygen, as sulphurous acid, phosphorous acid, and alcohols, decolorize it; under the influence of oxygen its color is restored.

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