seismic

Etymology

It is from Ancient Greek σεισμός (seismós, “a shaking, earthquake”) with the English suffix -ic,^{[2][3][4][5][6]} the Greek noun being from σείω (seíō, “to shake”);^[2][4][7] Etymonline analyses it as seismo- and the suffix.^[8] Etymonline takes the verb from Proto-Indo-European *twei- (“to agitate, shake”).^[8] The OED notes that the regular English form would have lacked the e, as French sismique does.^[2]

Earliest recorded meaning

Of or relating to earthquakes: 1858, in R. Mallet's report to the British Association.^[2][3] Barnhart says that seismic, seismograph and seismology were all taken from a British Association report on the work of the physicist Luigi Palmieri, who built a seismograph at the observatory on Vesuvius.^[3] Etymonline dates the adjective to 1852,^[8] and Dictionary.com to 1855–60.^[9]

Semantic evolution

The word was extended to earth vibrations caused by explosions, as in seismic prospecting, and to similar vibrations on the moon and other bodies.^[4][10] A figurative sense, "earth-shaking, of enormous effect", is recorded from 1962.^[2][4][11]

Timeline

• 1852 – first use according to Etymonline.^[8]
• 1858 – of or relating to earthquakes.^[2][3][10]
• 1962 – figurative, of enormous effect.^[2]

Meanings

Adjective

1. Of, caused by, or subject to earthquakes.^[10][11][2]
2. Of or relating to vibrations of the earth from other causes, such as explosions used in prospecting.^[10][4][11]
3. Of or relating to similar vibrations on another body, such as the moon.^[10]
4. Very great in scale or effect: The merger had seismic effects on the whole industry.^[10][11][2]

Word family

• seismically
• aseismic
• isoseismic
• nonseismic
• seismicity
• seismograph
• seismology
• seismic sea wave

Related words

• seismo-

References

1. ^ Wiktionary, the free dictionary, https://en.wiktionary.org
2. ^ a b c d e f g h i Oxford English Dictionary Online (accessed March 2026), Oxford: Oxford University Press
3. ^ a b c d Barnhart, Robert K., ed. (1995), The Barnhart Concise Dictionary of Etymology, New York: HarperCollins
4. ^ a b c d e Shorter Oxford English Dictionary on Historical Principles (2002), 5th ed., ed. William R. Trumble and Angus Stevenson, Oxford: Oxford University Press
5. ^ Hoad, T. F., ed. (1986), The Concise Oxford Dictionary of English Etymology, Oxford: Clarendon Press
6. ^ Stevenson, Angus, ed. (2010), Oxford Dictionary of English, 3rd ed., Oxford: Oxford University Press
7. ^ Weekley, Ernest (1921), An Etymological Dictionary of Modern English, London: John Murray
8. ^ a b c d Harper, Douglas. Online Etymology Dictionary, https://www.etymonline.com
9. ^ Dictionary.com Unabridged (2016), based on the Random House Unabridged Dictionary, New York: Random House
10. ^ a b c d e f Merriam-Webster Unabridged Dictionary (2024), online ed., Springfield, Mass.: Merriam-Webster
11. ^ a b c d Collins English Dictionary (2023), Glasgow: HarperCollins