hyperbaric chamber

noun
🔊/ˌhaɪpəˌbærɪk ˈtʃeɪmbə(r)/
🔊/ˌhaɪpərˌbærɪk ˈtʃeɪmbər/
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  1. a chamber in which the pressure is higher than normal, especially one in which people are treated after swimming deep underwater