noun.
A very large and destructive wave, generally caused by a tremendous disturbance in the ocean, such as an underseaearthquake or volcanic eruption.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
noun.
a cataclysm resulting from a destructive sea wave caused by an earthquake or volcanic eruption
Word Usage
"The term tsunami comes from two Japanese words that mean "harbor" and "wave.""