from The American Heritage® Dictionary of the English Language, 4th Edition

  • adj. Indicating coincidence of high tides or low tides.
  • adj. Of or relating to a line that passes through each location on a coastal map where tides occur at the same time of day.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. Describing the locations (and of related lines on a chart) linking places where tides occur at the same time of day

from the GNU version of the Collaborative International Dictionary of English

  • adj. Marking an equality in the tides; having high tide at the same time.

from The Century Dictionary and Cyclopedia

  • Marking an equality of tides.


co- +‎ tidal (Wiktionary)


  • The diagram I show you is a rough chart of cotidal lines, which I made out of the information contained in _Whitaker's Almanac_.

    Pioneers of Science


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