noun
also fon·ta·nelle |fänt ə n|el
( -s )
Etymology: Middle English fontinelle, from Middle French fontenele little spring, fontanel, diminutive of fontaine spring — more at fountain
1. obsolete
a. : an opening for the discharge of bodily secretions
b. : an ulcer or vent discharging secretions from the body
2. : a membrane-covered opening in bone or between bones ; specifically : one of the intervals closed by membranous structures between the uncompleted angles of the parietal bones and the neighboring bones of a fetal or young skull