n.
Any of the soft membranous gaps between the incompletely formed cranial bones of a fetus or an infant. Also called soft spot.
[Middle English fontinel, from Old French fontanele, diminutive of fontaine, fountain. See fountain.]
The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2009. Published by Houghton Mifflin Company. All rights reserved.
