from Wiktionary, Creative Commons Attribution/Share-Alike License
- a hydrous compound
from the GNU version of the Collaborative International Dictionary of English
- A combining form from Gr. �, �, water (see hydra).
- A combining form of hydrogen, indicating hydrogen as an ingredient
From Ancient Greek ὑδρο- (hydro-), from ὕδωρ (hydor, "water") (Wiktionary)