microcephalous

Adjective

WordNet 3.0

Adjective (1)

having an abnormally small head and underdeveloped brain“a nanocephalic dwarf”Synonyms: microcephalic nanocephalic

Webster's Dictionary (GCIDE)

Microcephalic \Mi`cro*ce*phal"ic\, Microcephalous \Mi`cro*ceph"a*lous\, a. [Micro- + cephalic, cephalous.] (Anat.) Having a small head; having the cranial cavity small; -- opposed to megacephalic. [1913 Webster] microchemical