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hydro

[hahy-droh] /ˈhaɪ droʊ/
noun, plural hydros for 2, 3.
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
4.
Informal. of, relating to, or furnishing water, water power, or hydroelectricity:
funds for new hydro projects.
Origin of hydro
1880-1885
1880-85; by shortening of compounds with hydro-1 (cf. -o); (def 4) hydro-1 analyzed as an adj.

hydro-1

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

1.
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. 2017.
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Examples from the Web for hydro
Historical Examples
  • hydro: relating to water: a combining form used as a prefix.

  • The Norfolk suit and the false moustache are in her room at the hydro.

    Cleek, the Master Detective

    Thomas W. Hanshew
  • This is done in a kind of wringing machine called a "hydro extractor."

    Clothing and Health Helen Kinne
  • Harbrace and the hydro engineer jumped for the communications phone.

    The Thirst Quenchers Rick Raphael
  • Designed to be used also as a hydro, with three step floats.

  • What do you know about that plant Mura grows in the hydro—the one called 'catnip'?

    Plague Ship Andre Norton
  • Was all this assembly the result of the discovery in the hydro?

    Plague Ship Andre Norton
  • Surely the few plants in the hydro and the dried leaves could not be stretched too far.

    Plague Ship Andre Norton
  • Van Rycke passed along the corridor on his way to the hydro, Sinbad at his heels.

    Plague Ship Andre Norton
  • But he and Mura had been with the youngster every minute that he had been in the hydro.

    Plague Ship Andre Norton
British Dictionary definitions for hydro

hydro1

/ˈhaɪdrəʊ/
noun (pl) -dros
1.
(Brit) (esp formerly) a hotel or resort, often near a spa, offering facilities for hydropathic treatment

hydro2

/ˈhaɪdrəʊ/
adjective
1.
short for hydroelectric
noun
2.
a Canadian name for electricity when it is supplied to a residence, business, institution, etc

Hydro

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

hydro-

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
Word Origin
from Greek hudōr water
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for hydro

short for hydroelectric, from 1916.

hydro-

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.

Online Etymology Dictionary, © 2010 Douglas Harper
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hydro in Medicine

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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hydro in Science
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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