'highwater' definitions:

Definition of 'highwater'

From: WordNet
noun
The tide when the water is highest [syn: high tide, high water, highwater] [ant: low tide, low water]

Definition of 'highwater'

From: GCIDE
  • highwater \highwater\, high water \high water\n.
  • 1. the tide when the water is highest; high tide. [WordNet sense 1]
  • Syn: high tide, high water. [WordNet 1.5]
  • 2. Water at its highest level, as in a river during a flood. [PJC]