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.
Source: Webster's 1828 American Dictionary ↗ · public-domain · returned verbatim, no AI