from
The Collaborative International Dictionary of English v.0.48
Hypophosphoric \Hy`po*phos*phor"ic\, a. [Pref. hypo- +
phosphoric.] (Chem.)
Pertaining to, or derived from, or containing, phosphorus in
a lower state of oxidation than in phosphoric compounds; as,
hypophosphoric acid.
[1913 Webster]
{Hypophosphoric acid} (Chem.), an acid, {P2H4O6}, produced by
the slow oxidation of moist phosphorus, and isolated only
as a solution in water. It is regarded as a condensation
product of one molecule of phosphoric acid with one of
phosphorous acid, by partial dehydration.
[1913 Webster]