Hydro Definition
 hīdrō 
  hydros
  
    noun
  
 A place, such as a spa, where people can receive hydropathic treatments.
 Webster's New World 
Hydroelectric power.
 Webster's New World 
A hydroelectric power plant.
 Webster's New World 
(Canada, uncountable) Electrical power supply; specifically : electrical power provided by a utility (as a publicly-owned one)
 I won't have lights until my house gets the hydro turned on.
 Wiktionary 
(UK, countable, dated) A spa.
Wiktionary 
    prefix
  
 Wiktionary 
Liquid.
 Hydrodynamics.
 American Heritage 
Hydrogen.
 Hydrochloride.
 American Heritage 
(zoology) Hydrozoa.
Wiktionary 
    affix
  
 Water.
 Hydrostatics, hydrometer.
 Webster's New World 
Containing hydrogen.
 Hydrocyanic acid.
 Webster's New World 
Other Word Forms of Hydro
Noun
Singular:
 hydroPlural:
 hydrosOrigin of Hydro
-  
Greek hudro-, hudr- from hudōr wed-1 in Indo-European roots
From American Heritage Dictionary of the English Language, 5th Edition
 From Ancient Greek ὑδρο- (hydro-), from ὕδωρ (hydor, “water")
From Wiktionary
From Ancient Greek ὕδωρ (hudōr, “water”).
From Wiktionary
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