First Known Use: 1858
Dictionary
seismic
adjective seis·mic \ˈsīz-mik, ˈsīs-\
: of, relating to, or caused by an earthquake
: very great or important
Full Definition of SEISMIC
1
: of, subject to, or caused by an earthquake; also : of or relating to an earth vibration caused by something else (as an explosion or the impact of a meteorite)
2
: of or relating to a vibration on a celestial body (as the moon) comparable to a seismic event on earth
3
: having a strong or widespread impact : earthshaking <seismic social changes>
— seis·mi·cal·ly \-mi-k(ə-)lē\ adverb
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Origin of SEISMIC
Greek seismos shock, earthquake, from seiein to shake; probably akin to Avestan thwaēshō fear
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