carina
C2CEFR level
92/100Rarity: very rare
TechnicalRegister
The ridge of cartilage at the point where the trachea divides into the two main bronchi.
The tube had been advanced too far and was abutting the carina.
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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