phosphorous

from WordNet (r) 3.0 (2006)

phosphorous
    adj 1: containing or characteristic of phosphorus; "phosphoric
           acid" [syn: {phosphorous}, {phosphoric}]

from The Collaborative International Dictionary of English v.0.48

Phosphorous \Phos"phor*ous\ (f[o^]s"f[o^]r*[u^]s), a. [Cf. F.
   phosphoreux.] (Chem.)
   Of or pertaining to phosphorus; resembling or containing
   phosphorus; specifically, designating those compounds in
   which phosphorus has a lower valence as contrasted with
   {phosphoric} compounds; as, phosphorous acid, {H3PO3}.
   [1913 Webster]