hydro-

¹

1. a combining form meaning “water,” used in the formation of compound words:

   hydroplane; hydrogen.

hydro-

²

1. a combining form representing hydrogen in compound words, denoting especially a combination of hydrogen with some negative element or radical:

   hydrobromic.

hydro

³

[ hahy-droh ]

noun

, plural hy·dros

1. Informal. hydroelectric power.
2. Informal. hydroplane.
3. British.
   1. a bathhouse, hotel, or resort catering to people taking mineral-water health cures; spa.
   2. an establishment furnishing hydrotherapy.

adjective

1. Informal. of, relating to, or furnishing water, water power, or hydroelectricity:

   funds for new hydro projects.

hydro

¹

/ ˈhaɪdrəʊ /

adjective

1. short for hydroelectric

noun

1. a Canadian name for electricity when it is supplied to a residence, business, institution, etc

Hydro

²

/ ˈhaɪdrəʊ /

noun

1. (esp in Canada) a hydroelectric power company or board

hydro

³

/ ˈhaɪdrəʊ /

noun

1. (esp formerly) a hotel or resort, often near a spa, offering facilities for hydropathic treatment

hydro-

⁴

combining_form

1. indicating or denoting water, liquid, or fluid

   hydrodynamics

   hydrolysis

2. indicating the presence of hydrogen in a chemical compound

   hydrochloric acid

3. indicating a hydroid

   hydrozoan

hydro–

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

Word History and Origins

Origin of hydro-¹

< Greek, combining form of hýdōr water

Origin of hydro-²

1880–85; by shortening of compounds with hydro- ¹ ( -o ); hydro ( def 4 ) hydro- ¹ analyzed as an adj.

Word History and Origins

Origin of hydro-¹

from Greek hudōr water

Example Sentences

Canada has abundant hydro potential — and in fact Manitoba and Quebec have abundant hydro for sale right now.

From The Daily Beast

Here, however, it's worth noting that heavy use of emissions-free hydro power correlates strongly with lower power rates.

From The Daily Beast

Alaska Electric Light and Power got a 24 percent residential rate hike to deal with inflation and to build a new hydro project.

From The Daily Beast

A large number of these mills are actuated hydraulically or hydro-electrically.

From Project Gutenberg

The hydro-electric industry has been largely nationalized by those who are foremost in it.

From Project Gutenberg

Retinol, ret′i-nol, n. a hydro-carbon oil used in printers' ink.

From Project Gutenberg

Next to my flight in the hydro-aeroplane this was the greatest experience of my life.

From Project Gutenberg

On this supposition the positive impulse is to be regarded as hydro-mechanical.

From Project Gutenberg