endosteum
C2CEFR level
96/100Rarity: very rare
TechnicalRegister
The thin cellular membrane lining the inner medullary cavity and trabecular surfaces of bone.
Remodelling proceeds along the endosteum as osteoclasts widen the marrow cavity with age.
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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