metalimnion noun. [mɛtǝ'lɪmnɪǝn] Pl. -nia [-nɪǝ]. M20.
[from META- + Greek limnion dim. of limnē lake.]
The layer of water in a stratified lake beneath the epilimnion and above the hypolimnion, in which the temperature decreases rapidly with depth.

■ metalimnetic [-lɪm'nɛtɪk] adjective of or within a metalimnion M20.

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