The Collaborative International Dictionary of English v.0.48:

Phosphoric \Phos*phor"ic\, a. [Cf. F. phosphorique.]
   1. (Chem.) Of or pertaining to phosphorus; resembling, or
      containing, phosporus; specifically, designating those
      compounds in which phosphorus has a higher valence as
      contrasted with the phosphorous compounds.
      [1913 Webster]

   2. Phosphorescent. "A phosphoric sea." --Byron.
      [1913 Webster]

   Glacial phosphoric acid. (Chem.)
      (a) Metaphosphoric acid in the form of glassy
          semitransparent masses or sticks.
      (b) Pure normal phosphoric acid.

   Phosphoric acid (Chem.), a white crystalline substance,
      H3PO4, which is the most highly oxidized acid of
      phosphorus, and forms an important and extensive series of
      compounds, viz., the phosphates.

   Soluble phosphoric acid, Insoluble phosphoric acid
      (Agric. Chem.), phosphoric acid combined in acid salts, or
      in neutral or basic salts, which are respectively soluble
      and insoluble in water or in plant juices.

   Reverted phosphoric acid (Agric. Chem.), phosphoric acid
      changed from acid (soluble) salts back to neutral or basic
      (insoluble) salts.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

metaphosphoric \met`a*phos*phor"ic\, a. [Pref. meta- +
   phosphoric.] (Chem.)
   Pertaining to, or designating, a monobasic acid, HPO3,
   analogous to nitric acid, and, by heating phosphoric acid,
   obtained as a crystalline substance, commonly called glacial
   phosphoric acid. Compare the tribasic orthophosphoric
   acid.
   [1913 Webster +PJC]