S: (n) tidal wave (a wave resulting from the periodic flow of the tides that is caused by the gravitational attraction of the moon and sun)
S: (n) tidal wave (an unusual (and often destructive) rise of water along the seashore caused by a storm or a combination of wind and high tide)
S: (n) tsunami (a cataclysm resulting from a destructive sea wave caused by an earthquake or volcanic eruption) "a colossal tsunami destroyed the Minoan civilization in minutes"