Dictionary.com

hydro

[ hahy-droh ]
/ ˈhaɪ droʊ /
Save This Word!

noun, plural hy·dros for 2, 3.

Informal. hydroelectric power.
Informal. hydroplane.
British.
  1. a bathhouse, hotel, or resort catering to people taking mineral-water health cures; spa.
  2. an establishment furnishing hydrotherapy.

adjective

Informal. of, relating to, or furnishing water, water power, or hydroelectricity: funds for new hydro projects.

QUIZZES

QUIZ YOURSELF ON AFFECT VS. EFFECT!

In effect, this quiz will prove whether or not you have the skills to know the difference between “affect” and “effect.”
Question 1 of 7
The rainy weather could not ________ my elated spirits on my graduation day.

Origin of hydro

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

Definition for hydro (2 of 3)

hydro-1

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

Origin of hydro-

1
<Greek, combining form of hýdōr water

Definition for hydro (3 of 3)

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 Unabridged Dictionary, © Random House, Inc. 2021

British Dictionary definitions for hydro (1 of 4)

hydro1
/ (ˈhaɪdrəʊ) /

noun plural -dros

British (esp formerly) a hotel or resort, often near a spa, offering facilities for hydropathic treatment

British Dictionary definitions for hydro (2 of 4)

hydro2
/ (ˈhaɪdrəʊ) /

adjective

short for hydroelectric

noun

a Canadian name for electricity when it is supplied to a residence, business, institution, etc

British Dictionary definitions for hydro (3 of 4)

Hydro
/ (ˈhaɪdrəʊ) /

noun

(esp in Canada) a hydroelectric power company or board

British Dictionary definitions for hydro (4 of 4)

hydro-

sometimes before a vowel hydr-


combining form

indicating or denoting water, liquid, or fluidhydrolysis; hydrodynamics
indicating the presence of hydrogen in a chemical compoundhydrochloric acid
indicating a hydroidhydrozoan
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

Medical definitions for hydro

hydro-

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.

Scientific definitions for hydro

hydro-

A prefix that means: “water” (as in hydroelectric) or “hydrogen,” (as in hydrochloride).
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Learning At Home Just Got Easier!