# polyphosphoric acid

> English word · Noun

## Definitions
1. Any of several ill-defined polymers of orthophosphoric acid; they are viscous, hygroscopic liquids

## Etymology
From poly- + phosphoric acid.

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/polyphosphoric-acid