an unusually large sea wave produced by a seaquake or undersea volcanic eruption.
Also called seismic sea wave.

1905–10; < Japanese, equivalent to tsu harbor (earlier tu) + nami wave

tsunamic [tsoo-nah-mik, -nam-ik] , adjective

cyclone, hurricane, tidal wave, tornado, tsunami, typhoon.
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World English Dictionary
tsunami (tsʊˈnæmɪ)
n , pl -mis, -mi
1.  a large, often destructive, sea wave produced by a submarine earthquake, subsidence, or volcanic eruption. Sometimes incorrectly called a tidal wave
2.  a sudden increase in or overwhelming number or volume of: the tsunami of Olympic visitors
[from Japanese, from tsu port + nami wave]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

1897, from Japanese tsunami, from tsu "harbor" + nami "waves."
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
tsunami   (ts-nä'mē)  Pronunciation Key 
A very large ocean wave that is caused by an underwater earthquake or volcanic eruption and often causes extreme destruction when it strikes land. Tsunamis can have heights of up to 30 m (98 ft) and reach speeds of 950 km (589 mi) per hour. They are characterized by long wavelengths of up to 200 km (124 mi) and long periods, usually between 10 and 60 minutes. See Note at tidal wave.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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American Heritage
Cultural Dictionary
tsunami [(tsooh-nah-mee)]

A large wave on the ocean, usually caused by an undersea earthquake, a volcanic eruption, or coastal landslide. A tsunami can travel hundreds of miles over the open sea and cause extensive damage when it encounters land. Also called tidal waves.

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Example sentences for tsunami
The movie does not convey the tsunami which followed directly after the explosion.
Communication buoy for a bottom pressure sensor, for tsunami detection.
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