# periodic acid

> English word · Noun · IPA /ˌpɜːɹaɪˈɒdɪk ˈæsɪd/

## Definitions
1. HIO₄ or H₅IO₆, the oxyacids of iodine in which iodine has the highest oxidation number; H₅IO₆ is a white crystalline substance (HIO₄ is not stable), and both are strong oxidizing agents.

## Etymology
From per- + iodic acid.

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