Definition of amphidromic 

: relating to a system of tidal action in which the tide wave progresses around a point or center of little or no tide amphidromic point amphidromic region

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First Known Use of amphidromic

circa 1900, in the meaning defined above

History and Etymology for amphidromic

Greek amphidromos running both ways (from amphi- + dromos course, racecourse) + English -ic

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The first known use of amphidromic was circa 1900

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