Undersuit

noun

noun ·Rare ·Advanced level

Definitions

Noun
  1. 1
    A soft undergarment worn by divers and astronauts.

    "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."

  2. 2
    Any suit worn under another suit; a suit of underclothes.

Example

More examples

"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."

Etymology

From under- + suit.

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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.