English Dictionary

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hydro- or (sometimes before a vowel) hydr-

Definitions

combining form

  1. indicating or denoting water, liquid, or fluid   ⇒ hydrolysis, hydrodynamics
  2. indicating the presence of hydrogen in a chemical compound   ⇒ hydrochloric acid
  3. indicating a hydroid   ⇒ hydrozoan

Word Origin

from Greek hudōr water

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