Main Entry:

hy·po·lim·ni·on

Pronunciation:

\ˌhī-pō-ˈlim-nē-ˌän, -nē-ən\

Function:

noun

Inflected Form(s):

plural hy·po·lim·nia \-nē-ə\

Etymology:

New Latin, from hypo- + Greek limnion, diminutive of limnē lake — more at limnetic

Date:

1910

: 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