profundal

adjective
pro·fun·dal | \prəˈfəndᵊl\

Definition of profundal 

: of, relating to, being, or living in the part of a thermally stratified lake that extends downward from the upper part of the hypolimnion to the bottom of the lake or in very deep lakes to 600 meters

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History and Etymology for profundal

Latin profundus deep + English -al

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