sclera
B2CEFR level
60/100Rarity: rare
TechnicalRegister
The tough white outer layer of the eyeball that maintains its shape and protects the inner structures.
A blue tinge to the sclera in an infant may point to an underlying connective-tissue disorder.
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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