hyperbaricPronunciation: /ˌhʌɪpəˈbarɪk/Definition of hyperbaric adjective of or involving a gas at a pressure greater than normal: a hyperbaric chamber hyperbaric oxygenOrigin: 1960s: from hyper- 'above normal' + Greek barus 'heavy'hyperbaric in other Oxford dictionaries Definition of hyperbaric in the US English dictionary