cotidal

co·tid·al

 (kō-tīd′l)
adj.
1. Indicating coincidence of high tides or low tides.
2. Of or relating to a line that passes through each location on a coastal map where tides occur at the same time of day.

cotidal

(kəʊˈtaɪdəl)
adj
(Navigation) (of a line on a tidal chart) joining points at which high tide occurs simultaneously

co•tid•al

(koʊˈtaɪd l)

adj.
1. pertaining to a coincidence of tides.
2. (on a chart or map) indicating a line connecting points at which high tide occurs at the same time.
[1825–35]
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References in periodicals archive ?
The reason for these exceptions lies in the behaviour of the cotidal lines linking two amphidromic points.
A region surrounding an amphidromic point from which radiating cotidal lines progress through all hours of the tidal cycle.