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phos·phate

n 1 a  :  a salt or ester of a phosphoric acid  b  :  the trivalent anion PO43- derived from phosphoric acid H3PO4  2  :  an organic compound of phosphoric acid in which the acid group is bound to nitrogen or a carboxyl group in a way that permits useful energy to be released (as in metabolism) .
 
 
 
Similar sounding terms:  phos·phide  phos·phite 

 
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