One of the mysteries of the English language finally explained.
An area of turbulence in a stream, an eddy.
Mid 19th century (in an earlier sense). From French remous tumult, agitation, turbulence created in the wake of a moving boat, swirling of a liquid around an obstacle, apparently from remoudre to grind (something) again, apparently arising from a comparison of the swirling movement of the water with the rotating movement of a grindstone.
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