Main Entry: fon·ta·nel

Variant(s): or fon·ta·nelle \ˌfänt-^ən-ˈel, ˈfänt-^ən-ˌ\

Function: noun

: a membrane-covered opening in bone or between bones ; specifically : any of the spaces closed by membranous structures between the uncompleted angles of the parietal bones and the neighboring bones of a fetal or young skull