Medical Dictionary
prebreathe
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transitive verb
pre·breathe
\(ˈ)prē-ˈbrēth\
Medical Definition of prebreathe
prebreathed
;prebreathing
: to breathe (pure oxygen) to purge the blood of nitrogen content in preparation for an activity (as a space walk) that involves exposure to a significant change in pressure which might otherwise cause decompression sickness
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