GNU Collaborative International Dictionary of English

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Found one definition

1.       
   highwater, high water n.
   1. the tide when the water is highest; high tide. [wns=1]
   
   Syn. -- high tide, high water.
   
   [WordNet 1.5]
   
   
   2. Water at its highest level, as in a river during a flood.
   
   [PJC]