hydro

a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.

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Dictionary.com Unabridged

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

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. 2013.
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Link To Hydro

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.

Water; liquid: hydrocephalus.
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).

Slang Dictionary

dro definition

and hydro

n.
hydroponically grown marijuana. : He raises hydro in his basement. , He's got some kickin' dro. Want a piece?

Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition.
Copyright 2007. Published by McGraw Hill.
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Example sentences

Mention has been made of magneto-hydro-dynamics, in other words, the study of

electrified plasma dynamics.

For this country, there are no new major hydro sources available.

The really exciting news, however, is that in certain materials the

hydro-capillary effect can be controlled electronically.

There is in existence today a way to store electrical energy,and that is in

hydro-electric facilities.

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