fontanelle
C1CEFR level
78/100Rarity: rare
TechnicalRegister
A soft membranous gap between the bones of a newborn's skull that later closes.
The anterior fontanelle felt soft and flat, which was a reassuring finding.
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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