Word with wave and pool (5)

I believe the answer is:

tidal

(Other definitions for tidal that I've seen before include "Affected by changes in sea level" , "(Of the sea) ebbing and flowing" , "To do with sea movements of lunar origin" , "(Waters) subject to moon/sun" , "Relating to sea rise/fall" .)

I've seen this clue in The New York Times.

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