Definitions for "Tsunamis"
Giant ocean waves (sometimes called "tidal waves") caused by an underwater earthquake or volcanic eruption.
A wave set up by a submarine earthquake, landslide, or volcanic action. Many such seismic disturbances do not produce sea waves and often those produced are small, but the occasional large wave can be very damaging to shore installations and dangerous to ships in harbors. The destructive wave is commonly referred to as a "tidal wave," a term which is technically incorrect, as it is not the result of tide-producing forces.
A huge sea wave caused by earthquakes. (Referred to by many as a tidal wave.)