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Meaning of thermocline

ther•mo•cline

Pronunciation: (thûr'mu-klīn"), [key]
— n.
  1. a layer of water in an ocean or certain lakes, where the temperature gradient is greater than that of the warmer layer above and the colder layer below. Cf.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.