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[hahy-puh-lim-nee-on, -nee-uh n, hip-uh-] /ˌhaɪ pəˈlɪm niˌɒn, -ni ən, ˌhɪp ə-/
noun, plural hypolimnia
[hahy-puh-lim-nee-uh, hip-uh-] /ˌhaɪ pəˈlɪm ni ə, ˌhɪp ə-/ (Show IPA)
(in certain lakes) the layer of water below the thermocline.
Origin of hypolimnion
1905-10; hypo- + Greek límn(ē) lake + -ion diminutive noun suffix
Related forms
[hahy-poh-lim-net-ik, hip-oh-] /ˌhaɪ poʊ lɪmˈnɛt ɪk, ˌhɪp oʊ-/ (Show IPA),
hypolimnial, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for hypolimnion
  • 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.
  • The lowest layer of pond water during summer is referred to as the hypolimnion.
  • Zooplankton in all spring casts, though fewer in hypolimnion.
  • Thermal stratification in summer and fall is coupled with anoxic conditions in the hypolimnion.
  • Few zooplankton in springtime epilimnion samples but a moderate amount of copepods in the hypolimnion samples.
  • The aerator does deliver oxygen to the hypolimnion and the lake is not thermally stratified, even in mid-summer.
  • The pond was stratified and although there was a deficiency in the hypolimnion, the thermocline was well oxygenated.
British Dictionary definitions for hypolimnion


the lower and colder layer of water in a lake
Word Origin
C20: from hypo- + Greek limnion, diminutive of limnē lake
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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