preoxygenation

noun
pre·ox·y·gen·ation | \ -ˌäk-si-jə-ˈnā-shən, -äk-ˌsij-ə- \

Medical Definition of preoxygenation 

: inhalation of large quantities of essentially pure oxygen usually as a prelude to some activity or medical procedure in which it is desirable to minimize nitrogen and maximize oxygen in the blood and tissues

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occurring twice a year or every two years

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