The coronal suture is the fibrous joint that unites the frontal bone with the two parietal bones of the skull.
From the en.wikipedia.org
First, in the morning I finally took the step of shaving the sparse fuzz remaining on my forehead all the way up to the coronal suture.
From the scienceblogs.com
This is a term sometimes used to describe the premature closure of the coronal suture plus any other suture, like the lambdoid, or it may be used to describe the premature fusing of all sutures.