leukocoria
C2CEFR level
98/100Rarity: very rare
TechnicalRegister
An abnormal white reflection from the pupil, classically signalling retinoblastoma in children.
The grandmother noticed leukocoria in a flash photograph, and examination confirmed an intraocular tumour.
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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