abyssal zone

noun

Definition of abyssal zone 

: the biogeographic realm consisting of the deep sea, lacking higher plant life because of the absence of light, and occupied chiefly by carnivorous animals that are often blind or have special luminous organs and are structurally adapted to withstand the great pressures of this level

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First Known Use of abyssal zone

1852, in the meaning defined above

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The first known use of abyssal zone was in 1852

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