[ sahyz-mik, sahys- ]
/ ˈsaɪz mɪk, ˈsaɪs- /


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

Origin of seismic

First recorded in 1855–60; seism + -ic

Related forms

seis·mi·cal·ly, adverbnon·seis·mic, adjectiveun·seis·mal, adjectiveun·seis·mic, adjective Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for seismic

British Dictionary definitions for seismic


/ (ˈsaɪzmɪk) /


relating to or caused by earthquakes or artificially produced earth tremorsAlso (less commonly): seismical (ˈsaɪzmɪkəl)
of enormous proportions or having highly significant consequencesseismic 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

Science definitions for seismic


[ sīzmĭk ]

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