Etymology
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seismic (adj.)

1852, "pertaining to or of the nature of an earthquake," from seismo- + -ic. Alternative seismal is by 1853. Related: Seismical; seismically; seismicity.

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Definitions of seismic

seismic (adj.)
subject to or caused by an earthquake or earth vibration;
Synonyms: seismal
From wordnet.princeton.edu