Definition of hydro- in English:

hydro-

Syllabification: hydro-
(also hydr-)

combining form

1Water; relating to water: hydraulic hydrocolloid
2 Chemistry Combined with hydrogen: hydrocarbon

Origin

from Greek hudōr 'water'.

Definition of hydro- in:

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Word of the day oleaginous
Pronunciation: ˌōlēˈajənəs
adjective
rich in, covered with, or producing oil; oily