king tide noun1 •(informal) An unusually high spring tide that occurs during full moon in the summer and winter months (when the earth is at perihelion and the earth, moon and sun are aligned).As an illustration of our vulnerability, in 1990 and again in 1991, the largest king tides of the year in the Marshall Islands almost inundated Majuro′s urban area. — 1994 formsking tides
