Webster's English Dictionary

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phosphate

phos.phate \'fa:s-.fa-t\ n [F, fr. acide phosphorique phosphoric acid] 1: a 
   salt or ester of a phosphoric acid  2: an effervescent drink of carbonated 
   water with a small amount of phospho ric acid or an acid phosphate flavored 
   with fruit syrup 3: a phosphatic material used for fertilizers