pressure suit

/P R EH1 SH ER0 S UW1 T/
noun
  1. 1

    A sealed, full-body garment, usually with an attachable helmet, which maintains air pressure or mechanical pressure around the body of an astronaut or aviator to compensate for the low density of the air at high altitudes.

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Source: https://en.wiktionary.org/wiki/pressure%20suit