English Dictionary

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hydro- or (sometimes before a vowel) hydr-


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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