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- (2 of 2)

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.

British Dictionary definitions for hydro-

hydro-

sometimes before a vowel hydr-


combining form

indicating or denoting water, liquid, or fluid hydrolysis; hydrodynamics
indicating the presence of hydrogen in a chemical compound hydrochloric acid
indicating a hydroid hydrozoan

Word Origin for hydro-

from Greek hudōr water

Medical definitions for hydro-

hydro-

pref.

Water; liquid:hydrocephalus.
Hydrogen:hydrochloride.

Scientific definitions for hydro-

hydro-

A prefix that means: “water” (as in hydroelectric) or “hydrogen,” (as in hydrochloride).