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Tsunamis are giant waves caused by earthquakes or volcanic eruptions under the sea. Out in the depths of the ocean, tsunami waves do not dramatically increase in height. But as the waves travel inland, they build up to higher and higher heights as the depth of the ocean decreases.
: a very high, large wave in the ocean that is usually caused by an earthquake under the sea and that can cause great destruction when it reaches land.plural tsunamis also tsunami.ull Definition of TSUNAMI. : a great sea wave produced especially by submarine earth movement or volcanic eruption: tidal wave. â tsuÂ·naÂ·mic \-mik\ adjective. See tsunami defined for English-language learners. See tsunami defined for kids.