From Longman Dictionary of Contemporary Englishhot tubˌhot ˈtub noun [countable] DHFa heated bath that several people can sit in together → Jacuzzi
Examples from the Corpus
hot tub• It boasts a hot tub, tennis court, heated pool and several smashing views of the Potomac.• But if you want to try a hot tub I can do better than that.• A sixteen-room hotel with a hot tub out back, and no guests.• One reveller was already pouring bubble bath into a huge hot tub so he and his partner could frolic in the suds.• He was sitting on the wooden lip of the hot tub. 