Also found in: Medical, Acronyms, Idioms, Encyclopedia, Wikipedia.


(word root) water
Examples of words with the root hydro-: hydroplane


n. pl. hy·dros
1. Hydroelectric power.
2. A hydroelectric power plant.


n, pl -dros
(Complementary Medicine) Brit (esp formerly) a hotel or resort, often near a spa, offering facilities for hydropathic treatment


(Electrical Engineering) short for hydroelectric
(Electrical Engineering) a Canadian name for electricity when it is supplied to a residence, business, institution, etc


(Electrical Engineering) (esp in Canada) a hydroelectric power company or board


(ˈhaɪ droʊ)

n., pl. -dros,
adj. n.
1. hydroelectric power.
2. a hydroplane.
3. Brit. a spa offering hydrotherapy.
4. of, pertaining to, or furnishing water, water power, or hydroelectricity.
[1880–85; by shortening of compounds with hydro-1 (compare -o)]


a combining form meaning “water”: hydroplane; hydrogen.
Also, esp. before a vowel, hydr-.
[< Greek, comb. form of hýdōr water]


a combining form representing hydrogen, used esp. in the names of chemical compounds in which hydrogen is combined with some negative element or radical: hydrobromic.
Also, esp. before a vowel, hydr-.


1. A prefix that means:
2. Water, as in hydrolectric.
3. Hydrogen, as in hydrolectric power.


[ˈhaɪdrəʊ] N (Brit) → balneario m


nKurhotel nt (mit Hydrotherapie)
References in classic literature ?
A potty little nine-hole affair at a hydro in the Midlands.
Before I joined him at Burry Mills Hydro, I spent a night at Holmescroft.
Baxter had taken me a room communicating with his own, and after lunch introduced me to a tall, horse-headed elderly lady of decided manners, whom a white-haired maid pushed along in a bath-chair through the park-like grounds of the Hydro.
Yet at mid-day, when I saw Miss Mary in her bathchair, Arthurs behind and Baxter and Miss Elizabeth on either side, in the park-like grounds of the Hydro, I found it difficult to arrange my words.
She almost lived at hotels and hydros, last year, but that isn't pleasant for her.
In addition, Hydro, an energy and aluminum group, will sell its share in Mexican casting plant Castech to the joint venture partner Grupo Industrial Saltillo, Saltillo, Mexico.
Pic River First Nation has become an essential partner in creating hydro generating stations.
For example, Ontario Hydro reorganized its corporate relations function last year to be more responsive to the needs of the utility's individual corporate branches.
Ontario Hydro cannot continue to play with private enterprise like this," he charged.
These must either be downsized or redesigned for improved efficiency before being renegotiated with Hydro.