( US usually fon·ta·nel ) / ˌfɒntəˈnel; NAmE ˌfɑːn-/ noun
( anatomy ) a space between the bones of a baby's skull , which makes a soft area on the top of the baby's head
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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.