[hahy-puh-lim-nee-on, -nee-uhn, hip-uh-]
noun, plural hypolimnia [hahy-puh-lim-nee-uh, hip-uh-] .
(in certain lakes) the layer of water below the thermocline.

1905–10; hypo- + Greek límn(ē) lake + -ion diminutive noun suffix

hypolimnetic [hahy-poh-lim-net-ik, hip-oh-] , hypolimnial, adjective
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World English Dictionary
hypolimnion (ˌhaɪpəʊˈlɪmnɪən)
the lower and colder layer of water in a lake
[C20: from hypo- + Greek limnion, diminutive of limnē lake]

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Example sentences
Tropical lakes and reservoirs are more susceptible to hypolimnion oxygen
  depletion than their temperate counterparts.
Samples from both the epilimnion and hypolimnion are collected monthly during
  the growing season.
Organic matter deposition in the hypolimnion can result in oxygen depletion for
  a portion of the year.
Most of the methylmercury is produced in the dry season in the anoxic portion
  of the hypolimnion in the reservoirs.
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