Crossword Genius

Like ocean motions (5)

Ross

I believe the answer is:

tidal

(Other definitions for tidal that I've seen before include "Relating to the flow of the sea" , "(Of the sea) ebbing and flowing" , "(Waters) subject to moon/sun" , "Ebbing and flooding" , "Affected by changes in sea level" .)

I've seen this clue in the Universal.
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