Source : Webster's Revised Unabridged Dictionary (1913)

Scaphocephaly \Scaph`o*ceph"a*ly\, n. [Gr. ska`fh a boat +
   kefalh` head.] (Anat.)
   A deformed condition of the skull, in which the vault is
   narrow, elongated, and more or less boat-shaped.

Source : WordNet®

scaphocephaly
     n : congenital malformation of the skull which is long and
         narrow; frequently accompanied by mental retardation