whirlpool

noun

1. water in rapid, violent, whirling motion caused by two meeting currents, by winds meeting tides, etc. and tending to form a circle into which floating objects are drawn; vortex or eddy of water
2. anything like a whirlpool, as in violent motion
3. ☆ a bath, as used in hydrotherapy, in which an agitating device propels a current of warm water with a swirling motion
   in full whirlpool bath