Found 2 items, similar to microcephalous.
English → English (WordNet) Definition: microcephalous microcephalous adj : having an abnormally small head and underdeveloped brain; “a nanocephalic dwarf” [syn: microcephalic, nanocephalic]
English → English (gcide) Definition: Microcephalous 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]