undersuit

Definition

A soft undergarment worn by divers and astronauts.

Etymology

From under- + suit.

Example Sentences

• "If you plan to dive all year round in the UK, you'll need a drysuit rather than a wetsuit. It won't let in water (a wetsuit traps a layer of water against the skin), but doesn't keep you warm, so you need a neoprene or membrane undersuit, too."