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[ep-uh-lim-nee-on, -uh n] /ˌɛp əˈlɪm niˌɒn, -ən/
noun, plural epilimnia
[ep-uh-lim-nee-uh] /ˌɛp əˈlɪm ni ə/ (Show IPA)
(in certain lakes) the layer of water above the thermocline.
Origin of epilimnion
1905-10; epi- + Greek límnion small pond, diminutive of límnē pool, lake
Related forms
[ep-uh-lim-net-ik] /ˌɛp ə lɪmˈnɛt ɪk/ (Show IPA),
epilimnial, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for epilimnion
  • The depth to which the epilimnion reaches depends on the clarity of the pond's waters and the terrain in which it is located.
  • As summer progresses, however, the epilimnion typically shrinks in size.
  • Few zooplankton in springtime epilimnion samples but a moderate amount of copepods in the hypolimnion samples.
  • The lower epilimnion sample is one meter above the upper knee.
  • The epilimnion is the uppermost layer of water, warmed by the sun.
British Dictionary definitions for epilimnion


the upper layer of water in a lake
Word Origin
C20: from epi- + 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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