hypocapnia
C2CEFR level
92/100Rarity: very rare
TechnicalRegister
A reduced arterial carbon dioxide tension, commonly resulting from hyperventilation.
Deliberate hypocapnia was once used to reduce brain volume, but is now applied cautiously because of cerebral vasoconstriction.
Rarity runs from 0 (a word everyone knows) to 100 (almost never seen outside specialist or literary writing). Level is the word's real difficulty on the CEFR scale, from A1 to C2.
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