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seismic

[sahyz-mik, sahys-] /ˈsaɪz mɪk, ˈsaɪs-/
adjective
1.
pertaining to, of the nature of, or caused by an earthquake or vibration of the earth, whether due to natural or artificial causes.
Also, seismal, seismical.
Origin
1855-1860
1855-60; seism + -ic
Related forms
seismically, adverb
nonseismic, adjective
unseismal, adjective
unseismic, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for seismical

seismic

/ˈsaɪzmɪk/
adjective
1.
relating to or caused by earthquakes or artificially produced earth tremors Also (less commonly) seismical (ˈsaɪzmɪkəl)
2.
of enormous proportions or having highly significant consequences: seismic social change
Derived Forms
seismically, 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
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Word Origin and History for seismical

seismic

adj.

1858, from seismo- + -ic.

Online Etymology Dictionary, © 2010 Douglas Harper
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seismical in Science
seismic
  (sīz'mĭk)   
Relating to an earthquake or to other tremors of the Earth, such as those caused by large explosions.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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