hilum
C2CEFR level
92/100Rarity: very rare
TechnicalRegister
The depression on the medial surface of each lung where the bronchi, vessels and nerves enter and leave.
Enlargement of the hilum reflected the bulky lymphadenopathy.
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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