# metaphosphoric acid

> English word · Noun

## Definitions
1. an anhydrous form of phosphoric acid that exists as a polymeric glassy solid, (HPO₃)ₙ; used as a drying agent and in dental cement

## Etymology
From meta- + phosphoric acid.

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