[ep-uh-lim-nee-on, -uhn]
noun, plural epilimnia [ep-uh-lim-nee-uh] .
(in certain lakes) the layer of water above the thermocline.

1905–10; epi- + Greek límnion small pond, diminutive of límnē pool, lake

epilimnetic [ep-uh-lim-net-ik] , epilimnial, adjective
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World English Dictionary
epilimnion (ˌɛpɪˈlɪmnɪən)
the upper layer of water in a lake
[C20: from epi- + Greek limnion, diminutive of limnē lake]

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