1. Referring to something which swims above or floats on the surface: The cook skimmed the supernatant fat off the top of the water of the boiled meat.

Oil is a supernatant fluid that moves on the surface of water.

2. A reference to that part of a floating body that is above the top of river or oceanic areas: There are all kinds of supernatant boats that can be suspended on water.
3. Etymology: From Latin supernatare, "to float"; from super-, "above, over" + natare, "to swim". © ALL rights are reserved.

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