scaphocephalic

noun Pathology.

1. premature closure of the sagittal suture resulting in a deformed skull having an elongated, keellike shape.

adjective

1. anatomy having a head that is abnormally long and narrow as a result of the two parietal bones on the top of the skull closing prematurely
2. an individual with such a headCompare dolichocephalic, brachycephalic

adj.

1. Having an abnormally long, narrow skull.