Hydro

[hahy-droh] /ˈhaɪ droʊ/

noun, plural hydros for 2, 3.
1.
Informal. hydroelectric power.
2.
Informal. .
3.
British.

adjective
4.
Informal. of, relating to, or furnishing water, water power, or hydroelectricity:
funds for new hydro projects.
1.
a combining form meaning “water,” used in the formation of compound words:
hydroplane; hydrogen.
1.
a combining form representing hydrogen, in compound words, denoting especially a combination of hydrogen with some negative element or radical:
hydrobromic.
/ˈhaɪdrəʊ/
noun (pl) -dros
1.
(Brit) (esp formerly) a hotel or resort, often near a spa, offering facilities for hydropathic treatment
/ˈhaɪdrəʊ/
adjective
1.
short for hydroelectric
noun
2.
a Canadian name for electricity when it is supplied to a residence, business, institution, etc
/ˈhaɪdrəʊ/
noun
1.
(esp in Canada) a hydroelectric power company or board
combining form
1.
indicating or denoting water, liquid, or fluid: hydrolysis, hydrodynamics
2.
indicating the presence of hydrogen in a chemical compound: hydrochloric acid
3.
indicating a hydroid: hydrozoan

short for hydroelectric, from 1916.

before vowels hydr-, word-forming element meaning “water,” from Greek hydro-, comb. form of hydor “water” (see water (n.1)). Also sometimes a comb. form of hydrogen.

hydro- or hydr-
pref.

hydro-
A prefix that means: “water” (as in hydroelectric) or “hydrogen,” (as in hydrochloride).