I. ˈsī]zmik, -mēk also ]sm- sometimes ˈse] or ˈsā] or ˈsē] adjective
also seis·mi·cal -mə̇kəl, -mēk-
Etymology: Greek seism os shock, earthquake (from seiein to shake, quake) + English -ic, -ical; akin to Sanskrit tveṣati he is violently moved
: of, subject to, or caused by an earthquake or an earth vibration produced artificially (as by an explosion in geophysical prospecting)
• seis·mi·cal·ly -mə̇k(ə)lē, -mēk-, -li\ adverb
II. adjective
: having a strong or widespread impact : earthshaking
seismic social changes