# hydro-

> English word · Prefix · IPA /ˈhaɪ.dɹoʊ/

## Definitions
1. water
2. liquid
3. hydrogen
4. a hydrous compound
5. Hydrozoa

## Etymology
From Ancient Greek ὑδρο- (hudro-), from ὕδωρ (húdōr, “water”).

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