American Heritage® Dictionary of the English Language, Fourth Edition
- n. A clear, colorless or slightly yellow liquid, H3PO2, used as a reducing agent.
GNU Webster's 1913
- adj. (Chem.) , an acid, H3PO2, whose salts are produced by the action of barium hygrate on phosphorus. It may be obtained from its water solution, by exaporation and freezing, as a white crystalline substance. It is a powerful reducing agent.
- n. a clear or yellow monobasic acid (H3PO2)
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