Tsunami is a Japanese word for a large wave coming ashore from a body of water, such as an ocean. These types of waves are capable of causing great damage to life and property in coastal areas. Such waves are typically caused by seismic events, such as earthquakes.

In 2366, the people of Bre'el IV feared a tsunami would result from the impact of their moon on the surface of their planet. (TNG: "Deja Q")

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