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Answer for the clue "A salt or ester of polyphosphoric acid ", 13 letters:
polyphosphate

Word definitions for polyphosphate in dictionaries

Wikipedia Word definitions in Wikipedia
Polyphosphates are salts or esters of polymeric oxyanions formed from tetrahedral PO ( phosphate ) structural units linked together by sharing oxygen atoms. Polyphosphates can adopt linear or a cyclic ring structures. In biology, the polyphosphate esters ...

WordNet Word definitions in WordNet
n. a salt or ester of polyphosphoric acid

Wiktionary Word definitions in Wiktionary
n. (context chemistry English) any of a class of inorganic polymers containing linked phosphate groups; the low molecular weight polymers, such as sodium tripolyphosphate, are used in water softening and as food additives