Hydro
Hydro , noun
1.
A hydro-aeroplane. [obsolescent]
2.
hydroelectric power; -- also used attributively.
Hydro-
1.
A combining form from Greek {not transcribed}, {not transcribed}, water (see Hydra).
2.
(Chemistry) A combining form of hydrogen, indicating hydrogen as an ingredient, as hydrochloric; or a reduction product obtained by hydrogen, as hydroquinone.
Also: Hydr-