seismic
adjective /ˈsaɪzmɪk/
/ˈsaɪzmɪk/
[only before noun]- connected with or caused by earthquakes
- seismic waves
- having a very great effect; of very great size
- a seismic shift in the political process
Word Originmid 19th cent.: from Greek seismos ‘earthquake’ (from seien ‘to shake’) + -ic.