Noun
A soft undergarment worn by divers and astronauts.
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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.
Any suit worn under another suit; a suit of underclothes.