peak flow
B1CEFR level
40/100Rarity: uncommon
TechnicalRegister
The maximum speed at which a person can exhale, used to monitor asthma control.
Her peak flow had dropped to half her personal best, indicating a severe attack.
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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