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n. pl. tsu·na·mis or tsunami
A very large ocean wave caused by an underwater earthquake or volcanic eruption.
[Japanese : tsu, harbor + nami, wave (so called because tsunamis generally pass unnoticed on the open sea, causing a slight swell, but rise to cause damage in the shallow waters of harbors ).]
tsu·na′mic (-mĭk) adj.
(Physical Geography) belonging or relating to a tsunami, or like a tsunami