HYPOPHOS'PHOROUS, noun [Gr. phosphorus.] The hypophosphorous acid contains less oxygen than the phosphorous, and is obtained from the phosphuret of baryte. It is a liquid which may be concentrated by evaporation, till it becomes viscid. It has a very sour taste, reddens vegetable blues, and does not crystalize.
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Webster's Dictionary 1828
American Dictionary of the English Language, Noah Webster, 1828.