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n. A layer in a large body of water, such as a lake, that sharply separates regions differing in temperature, so that the temperature gradient across the layer is abrupt.

n. A layer within a body of water or air where the temperature changes rapidly with depth.

n. A layer within a large body of water sharply separating portions of it which differ in temperature, so that the temperature-gradient through the layer is very abrupt.

"In between the two layers, there is a narrow zone called the thermocline where the temperature of the water changes rapidly."

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