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sodium tripolyphosphate

[trahy-pol-ee-fos-feyt]
noun Chemistry.
  1. a white powder, Na5P3O10, used as a water softener, sequestering agent, and food additive.
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Origin of sodium tripolyphosphate

First recorded in 1940–45; tri- + poly- + phosphate
Also called sodium triphosphate.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018