Definition of "megatsunami" []

• A very large tsunami. (noun)

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• "However, along with Ted Bryant of the University of Wollongong, Masse began looking for geological signs of a "megatsunami"."
• "But as well as moving the methane, and causing a megatsunami, the consequences would be to vaporize a large amount of water all at once."
• "That landslide surged into nearby Spirit Lake, triggering a megatsunami some 853 feet high."