H3PO4

Phosphoric Phos*phor"ic, a. [Cf. F. phosphorique.] 1. (Chem.) Of or pertaining to phosphorus; resembling, or containing, from us; 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]