hemicephalia

[ hĕm′ē-sə-fālē-ə, -fālyə ]

n.

Congenital failure of the cerebrum to develop normally, usually with the cerebellum and basal ganglia in rudimentary form.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.