Meaning of hot tub

hot' tub"

Pronunciation: [key]
  1. a wooden tub, usually large enough to accommodate several persons, that is filled with hot aerated water and often equipped with a thermostat and whirlpool: used for recreation or physical therapy and often placed out of doors, as on a porch.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.