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Webster 1913 Edition

(k?-t?d′al)

Adj.

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

Cotidal lines

(Phys. Geog.)

lines on a map passing through places that have high tide at the same time.

See also: co-tidal

cotidal ‎(not comparable)

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

relating to locations where tides occur at the same time of the day

Borrowing from English cotidal.

cotidal m ‎(feminine singular cotidale, masculine plural cotidaux, feminine plural cotidales)