hydro

[hahy-droh]
noun, plural hydros for 2, 3.
1.
Informal. hydroelectric power.
2.
Informal. hydroplane.
3.
British.
a.
a bathhouse, hotel, or resort catering to people taking mineral-water health cures; spa.
b.
an establishment furnishing hydrotherapy.
adjective
4.
Informal. of, pertaining to, or furnishing water, water power, or hydroelectricity: funds for new hydro projects.

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

Dictionary.com Unabridged

hydro-

1
a combining form meaning “water,” used in the formation of compound words: hydroplane; hydrogen.
Also, especially before a vowel, hydr-1.


Origin:
< Greek, combining form of hýdōr water

hydro-

2
a combining form representing hydrogen, in compound words, denoting especially a combination of hydrogen with some negative element or radical: hydrobromic.
Also, especially before a vowel, hydr-2.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
hydro1 (ˈhaɪdrəʊ)
 
n , pl -dros
(Brit) (esp formerly) a hotel or resort, often near a spa, offering facilities for hydropathic treatment

hydro2 (ˈhaɪdrəʊ)
 
adj
1.  short for hydroelectric
 
n
2.  a Canadian name for electricity when it is supplied to a residence, business, institution, etc

Hydro (ˈhaɪdrəʊ)
 
n
(esp in Canada) a hydroelectric power company or board

hydro- or (sometimes before a vowel) hydr-
 
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
 
[from Greek hudōr water]
 
hydr- or (sometimes before a vowel) hydr-
 
combining form
 
[from Greek hudōr water]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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American Heritage
Medical Dictionary

hydro- or hydr-
pref.

  1. Water; liquid: hydrocephalus.

  2. Hydrogen: hydrochloride.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
hydro-  
A prefix that means: "water" (as in hydroelectric) or "hydrogen," (as in hydrochloride).
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
As water stocks in key hydro stations decline, the regular dry season is
  approaching.
They also include hydro drainage ports and a ventilated foot bed for quick
  drying after wading in the surf.
Hydro is a renewable source of power with zero emissions.
Hydro electric power is a great combination with wind power which needs a back
  up that can be efficiently throttled.
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