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hypolimnion

[hahy-puh-lim-nee-on, -nee-uh n, hip-uh-]
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noun, plural hy·po·lim·ni·a [hahy-puh-lim-nee-uh, hip-uh-] /ˌhaɪ pəˈlɪm ni ə, ˌhɪp ə-/.
  1. (in certain lakes) the layer of water below the thermocline.
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Origin of hypolimnion

1905–10; hypo- + Greek límn(ē) lake + -ion diminutive noun suffix
Related formshy·po·lim·net·ic [hahy-poh-lim-net-ik, hip-oh-] /ˌhaɪ poʊ lɪmˈnɛt ɪk, ˌhɪp oʊ-/, hy·po·lim·ni·al, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for hypolimnion

hypolimnion

noun
  1. the lower and colder layer of water in a lake
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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 Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012