megatsunami

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/ˌmɛɡətsuːˈnɑːmi//ˌmɛɡəsuːˈnɑːmi/

noun

An extremely large tsunami-like wave caused by an avalanche or landslide displacing large amounts of water very quickly.

OriginEnglish tsunami ← Japanese 津波 (tsunami) ← Ancient Greek μέγᾰς (mégăs) →
Scrabble 16
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Meanings

nounmegatsunami (plural megatsunamis or megatsunami)

plural megatsunamis

  1. geographyAn extremely large tsunami-like wave caused by an avalanche or landslide displacing large amounts of water very quickly.
  2. broadlyA very large tsunami.

Origin

  1. Proto-Indo-European*méǵh₂s
  2. Proto-Hellenic*mégas
  3. Ancient Greekμέγᾰς (mégăs)
  4. Englishmega-
  5. Japanese津波 (tsunami)
  6. Englishtsunami
  7. Englishmegatsunami

From mega- + tsunami.

Full word history & related roots →

Translations

Bulgarian мегацуна́ми
  • мегацуна́ми (megacunámi)extremely large wave caused by an avalanche or landslide
Catalan megatsunami
  • megatsunamiextremely large wave caused by an avalanche or landslide
Chinese Cantonese 大海嘯 /大海啸
  • 大海嘯 /大海啸extremely large wave caused by an avalanche or landslide
Chinese Mandarin 大海嘯 /大海啸
  • 大海嘯 /大海啸 (dàhǎixiào)extremely large wave caused by an avalanche or landslide
Finnish megatsunami
  • megatsunamiextremely large wave caused by an avalanche or landslide
French mégatsunami
  • mégatsunamiextremely large wave caused by an avalanche or landslide
German Megatsunami
  • Megatsunamiextremely large wave caused by an avalanche or landslide
Hungarian megacunami
  • megacunamiextremely large wave caused by an avalanche or landslide
Italian megatsunami
  • megatsunamiextremely large wave caused by an avalanche or landslide
Japanese 大津波
  • 大津波 (ōtsunami)extremely large wave caused by an avalanche or landslide
Polish megatsunami
  • megatsunamiextremely large wave caused by an avalanche or landslide
Portuguese megatsunami
  • megatsunamiextremely large wave caused by an avalanche or landslide
Russian мегацуна́ми
  • мегацуна́ми (megacunámi)extremely large wave caused by an avalanche or landslide
Spanish megatsunami
  • megatsunamiextremely large wave caused by an avalanche or landslide
Cite this entry
APA

megatsunami. (n.d.). In WatkinsX Dictionary. Retrieved November 4, 2026, from https://dictionary.watkinsx.com/word/megatsunami

MLA

“megatsunami.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/megatsunami. Accessed November 4, 2026.

Chicago

WatkinsX Dictionary, s.v. “megatsunami,” accessed November 4, 2026, https://dictionary.watkinsx.com/word/megatsunami.

Source: megatsunami on Wiktionary, CC BY-SA 4.0.