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abyssal US English

Relating to or denoting the depths or bed of the ocean, especially between about 10,000 and 20,000 feet (3,000 and 6,000 m) down

abyssal plain US English

An extensive level area of the deep ocean floor, typically situated between the foot of the continental rise and an oceanic trench and covered with a smooth layer of sediment.

abyssal zone US English

The deep part of the ocean, now typically from a depth of 3000 metres (1.9 miles) down to 6000 metres (3.7 miles), though the numerical limits, especially the upper one, vary.