hyperbarism

Disturbances in the body resulting from the pressure of ambient gases at greater than 1 atmosphere; e.g., nitrogen narcosis, oxygen toxicity, bends. [hyper- + G. baros, weight]

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hy·per·bar·ism (hi″pər-barґiz-əm) the condition resulting from exposure to ambient gas pressure or atmospheric pressures that exceed the pressure within body tissues, fluids, and cavities.