polyphosphoric acid

World English Dictionary
polyphosphoric acid (ˌpɒlɪfɒsˈfɒrɪk)
1.  any one of a series of oxyacids of phosphorus with the general formula Hn+2PnO3n+1. The first member is pyrophosphoric acid (n = 2) and the series includes the highly polymeric metaphosphoric acid. The higher acids exist in an equilibrium mixture
2.  a glassy or liquid mixture of orthophosphoric and polyphosphoric acids: used industrially as a dehydrating agent, catalyst, and oxidizing agent

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polyphosphoric acid

a series of oxyacids of phosphorus 
WordNet® 3.0, © 2006 by Princeton University.
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