• synonyms


[sahyz-mik, sahys-]
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  1. pertaining to, of the nature of, or caused by an earthquake or vibration of the earth, whether due to natural or artificial causes.
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Sometimes seis·mal [sahyz-muh l, sahys-] /ˈsaɪz məl, ˈsaɪs-/, seis·mi·cal.

Origin of seismic

First recorded in 1855–60; seism + -ic
Related formsseis·mi·cal·ly, adverbnon·seis·mic, adjectiveun·seis·mal, adjectiveun·seis·mic, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Related Words for seismic

tectonic, tremorous, tremulous, quivering, quaky, groundbreaking, profound, churning, tumultuous

Examples from the Web for seismic

Contemporary Examples of seismic

Historical Examples of seismic

British Dictionary definitions for seismic


  1. relating to or caused by earthquakes or artificially produced earth tremorsAlso (less commonly): seismical (ˈsaɪzmɪkəl)
  2. of enormous proportions or having highly significant consequencesseismic social change
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Derived Formsseismically, adverb
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for seismic


1858, from seismo- + -ic.

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Online Etymology Dictionary, © 2010 Douglas Harper

seismic in Science


  1. Relating to an earthquake or to other tremors of the Earth, such as those caused by large explosions.
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The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.