parenchyma
C2CEFR level
85/100Rarity: very rare
TechnicalRegister
The functional tissue of an organ; in the lung, the alveoli responsible for gas exchange.
The infection had spread from the airways into the surrounding lung parenchyma.
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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