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1)
#19,771
Common
Meaning
    1. deep sea; depths of the sea; ocean depths
      The coelacanth inhabits the deep sea.
    1. EN The deep sea or deep layer is the lowest layer in the ocean, existing below the thermocline and above the seabed, at a depth of 1000 fathoms (1800 m) or more.
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12)
#392,701
Meaning
    1. abyssal plain (2,200-5,500m)
    1. EN An abyssal plain is an underwater plain on the deep ocean floor, usually found at depths between 3,000 metres (9,800 ft) and 6,000 metres (20,000 ft).
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