## AI Etymology
Seism comes from Ancient Greek 'seismos' ('a shaking, earthquake'), from 'seiein' ('to shake'). The historical chain includes Ancient Greek seismos and Ancient Greek seiein. Older glosses in the chain include "seismos", "a shaking, earthquake", "seiein", and "to shake", which help explain the semantic range of the modern word. Morphologically, seism is best read as borrowing, yielding an English noun shaped by both form history and later usage. In current English it functions as a noun, with the sense "an earthquake or earth tremor". English derivatives include seismic and seismal; related forms include seismic, seismograph, and seismology. The result is an English noun whose etymology preserves the older forms while supporting the word's specialized modern meaning.

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- Nature & Landscape

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