
An amphidromic point is a point of zero amplitude of one harmonic constituent of the tide. The tidal range (the amplitude, or height difference between high tide and low tide) for that harmonic constituent increases with distance from this point. These points are sometimes called tidal nodes. The term amphidromic point derives from the Greek words...
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http://en.wikipedia.org/wiki/Amphidromic_point

(from the article `tide`) ...of continents, and effects associated with the water depth result in much more complicated behaviour. For the main oceans, a combination of theory ...
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http://www.britannica.com/eb/a-z/a/65

A point on a chart of cotidal lines from which the cotidal lines radiate.
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http://www.encyclo.co.uk/local/20124

a point of almost zero tidal fluctuation on the ocean surface, represented on a chart of cotidal lines by a point from which these lines radiate.
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https://www.infoplease.com/dictionary/amphidromic-point
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