Pronunciation: (fos'fāt), [key]
a. (loosely) a salt or ester of phosphoric acid.
b. a tertiary salt of orthophosphoric acid, as sodium phosphate.
2. Agric.a fertilizing material containing compounds of phosphorus.
3. a carbonated drink of water and fruit syrup containing a little phosphoric acid.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.