epilimnion

noun
epi·​lim·​ni·​on | \ˌe-pə-ˈlim-nē-ˌän, -nē-ən\

Definition of epilimnion 

: the water layer overlying the thermocline of a lake

First Known Use of epilimnion

circa 1910, in the meaning defined above

History and Etymology for epilimnion

epi- + Greek límnē "standing water, pool, marshy lake" + -ion, noun suffix — more at limnetic

Note: See note at hypolimnion.

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The first known use of epilimnion was circa 1910

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