n 1  :  the act or process of combining or treating with water: as  a  :  the introduction of additional fluid into the body < sometimes helps to reduce the concentration of toxic substances in the tissues>   b  :  a chemical reaction in which water takes part with the formation of only one product < of ethylene to ethyl alcohol>  : esp  :  a reaction in which water takes part in the form of intact molecules  2  :  the quality or state of being hydrated : esp  :  the condition of having adequate fluid in the body tissues .
 
 
 
Similar sounding terms:   tertian  tor·sion  tri·chi·na or Trichina 
 
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