HYPOPHOSPHOROUS
Etymology
Adjective
hypophosphorous (not comparable)
(chemistry) Of or pertaining to hypophosphorous acid or its derivatives
Source: Wiktionary
Hy`po*phos"phor*ous, a. Etym: [Pref. hypo- + phosphorous.] (Chem.)
Definition: Pertaining to, or containing, phosphorus in a lower state of
oxidation than in phosphoric compounds; as, hypophosphorous acid.
Hypophosphorous acid (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.
Source: Webster’s Unabridged Dictionary 1913 Edition