from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A very large ocean wave caused by an underwater earthquake or volcanic eruption.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A very large and destructive wave, generally caused by a tremendous disturbance in the ocean, such as an undersea earthquake or volcanic eruption.
from The Century Dictionary and Cyclopedia
- n. A great tidal disturbance which may be caused by earthquakes, volcanic eruptions, or barometric depressions.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. a cataclysm resulting from a destructive sea wave caused by an earthquake or volcanic eruption
Japanese : tsu, port + nami, wave.(American Heritage® Dictionary of the English Language, Fourth Edition)
From Japanese 津波 / 津浪 (つなみ (tsunami, "seismic sea wave", literally "harbour wave")). (Wiktionary)