# phosphite

> English word · Noun

## Definitions
1. any salt or ester of phosphorous acid
2. the anion PO₃³⁻, or the trivalent radical PO₃

## Etymology
From phosphorous + -ite.

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