phototherapy
B2CEFR level
55/100Rarity: uncommon
TechnicalRegister
Treatment of neonatal jaundice using blue light to break down bilirubin in the skin.
His bilirubin level crossed the treatment line, so we started phototherapy overnight.
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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