alternative form of hydro-, used before a vowel that is not an o.

listen to the pronunciation of alternative form of hydro-, used before a vowel that is not an o.
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Определение alternative form of hydro-, used before a vowel that is not an o. в Английский Язык Английский Язык словарь

Alternative form of hydro-, used before a vowel that is not an o.
hydr-