ˌ ̷ ̷ ̷ ̷ˈlimnēˌän, -ēən noun
( plural hypolim·nia -ēə)
Etymology: New Latin, from hypo- + Greek limnion small lake, diminutive of limnē lake, sea
: 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 — compare epilimnion