Definition of hydro- in English:

hydro-

Pronunciation: /ˈhʌɪdrəʊ/
(also hydr-)

combining form

1Water; relating to water: hydraulic hydrocolloid
1.1 Medicine Affected with an accumulation of serous fluid: hydrocephalus
2 Chemistry Combined with hydrogen: hydrocarbon

Origin

from Greek hudōr 'water'.

Definition of hydro- in:

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Word of the day flippant
Pronunciation: ˈflipənt
adjective
not showing a serious or respectful attitude