noun \ˌhī-pō-ˈlim-nē-ˌän, -nē-ən\
plural hy·po·lim·nia\-nē-ə\

Definition of HYPOLIMNION

:  the part of a lake below the thermocline made up of water that is stagnant and of essentially uniform temperature except during the period of overturn


New Latin, from hypo- + Greek limnion, diminutive of limnē lake — more at limnetic
First Known Use: 1910


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