seismic

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seis·mic / ˈsīzmik/ • adj. of or relating to earthquakes or other vibrations of the earth and its crust. ∎  relating to or denoting geological surveying methods involving vibrations produced artificially by explosions. ∎ fig. of enormous proportions or effect: there are seismic pressures threatening American society.DERIVATIVES: seis·mi·cal adj.seis·mi·cal·ly / -ik(ə)lē/ adv.