tsunamic
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tsu·na·mi
(tso͞o-nä′mē)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.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
tsunamic
(tsʊˈnæmɪk)adj
(Physical Geography) belonging or relating to a tsunami, or like a tsunami
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014