Undersuit Definition
    noun
  
 A soft undergarment worn by divers and astronauts.
Wiktionary 
Any suit worn under another suit; a suit of underclothes.
Wiktionary 
Other Word Forms of Undersuit
Noun
Singular:
 undersuitPlural:
 undersuitsOrigin of Undersuit
-  
under- + suit
From Wiktionary
 
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