otocephaly

[ō′tō-sĕfə-lē]
n.
  1. A congenital malformation of the head characterized by a markedly diminished or absent lower jaw and the joining or close approach of the ears on the front of the neck below the face.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.