Hȳ'po-phōs'phor-ōŭs, a.

a. [Prefix hypo and phosphorous, q. v.; Fr. hypophosphoreux.] (Chem.) Composed of phosphorus and oxygen, but containing an inferior quantity of the latter; as, hypophosphorous acid, an acid containing less oxygen than phosphorous acid does. It exists only in combination with water, as a viscid and intensely acid fluid. Ure.