The Collaborative International Dictionary
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.
Douglas Harper's Etymology Dictionary
Wiktionary
a. Having an abnormally small head n. A microcephalic person
WordNet
adj. having an abnormally small head and underdeveloped brain; "a nanocephalic dwarf" [syn: microcephalous, nanocephalic]
Usage examples of "microcephalic".
After a hard day of toiling in the wheat fields of some equally brain-damaged noble, there was nothing the average serf would rather do than down a couple pints of ale and go have some cross-eyed microcephalic with a wooden leg give him a blow job.
Saddler thought it in questionable taste to exhibit a poor microcephalic idiot that way.
The taller of the two shuffled forward, a hairless mountain of flesh with the small eyes, unfocused gaze, and microcephalic skull of the terminally retarded.
The microcephalic shoved a broad thumb against the supine figure in the area between the umbilicus and the breasthone.