Definition of fontanelle noun from the Oxford Advanced Learner's Dictionary

 

fontanelle

 noun
(usually US English fontanel)noun
BrE BrE//ˌfɒntəˈnel//
 
; NAmE NAmE//ˌfɑːntəˈnel//
 
(anatomy)
 
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a space between the bones of a baby’s skull, which makes a soft area on the top of the baby’s head Word Origin mid 16th cent. (denoting a hollow of the skin between muscles): from French, from modern Latin fontanella, from an Old French diminutive of fontaine, from late Latin fontana, feminine of Latin fontanus, adjective from fons, font- ‘a spring’. The current sense dates from the mid 18th cent.