from The American Heritage® Dictionary of the English Language, 4th Edition
- n. An earthquake originating under the sea floor.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. An earthquake whose epicentre is beneath the sea
from the GNU version of the Collaborative International Dictionary of English
- n. A quaking of the sea.
from The Century Dictionary and Cyclopedia
- n. An earthquake which takes place beneath the ocean.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. an earthquake at the sea bed
sea + (earth)quake.(American Heritage® Dictionary of the English Language, Fourth Edition)