hot tub

noun
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.

Origin:
1970–75, Americanism

hot-tubber, noun
hot-tubbing, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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WordNet
hot tub

noun
a very large tub (large enough for more than one bather) filled with hot water 
WordNet® 3.0, © 2006 by Princeton University.
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Example sentences
Head to the hot tub or the steam room to warm up again, then repeat the routine
  as you wish.
If you are new to hot tub maintenance, order a start-up chemical package that
  will have everything you need.
Meteor showers observed from the hot tub this evening.
They are free not to show up, ignore trainers' advice, or spend all day in the
  hot tub instead of working out on the equipment.
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