from The American Heritage® Dictionary of the English Language, 4th Edition
- n. See earthquake.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A shaking of the Earth's surface; an earthquake or tremor.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. shaking and vibration at the surface of the earth resulting from underground movement along a fault plane of from volcanic activity
Greek seismos, from seiein, to shake.(American Heritage® Dictionary of the English Language, Fourth Edition)
From Ancient Greek σεισμός (seismos, "shaking; earthquake"). (Wiktionary)