noun
a flat expanse of the deep ocean floor, usually found at depths greater than 2000 meters
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The abyssal plain is a flat, sediment-covered area of the ocean floor.
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I heard that the abyssal plain is like the desert of the ocean.
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The abyssal plain is basically the ocean's version of a boring field.
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In the depths of her mind, there lies an abyssal plain of forgotten memories.