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n. pl. mi·cro·ceph·a·lies
Abnormal smallness of the head.

mi′cro·ce·phal′ic (-sə-făl′ĭk) adj. & n.
mi′cro·ceph′a·lous (-sĕf′ə-ləs) adj.
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Adj.1.microcephalous - having an abnormally small head and underdeveloped brain; "a nanocephalic dwarf"
References in periodicals archive ?
46 Someone or something microcephalous has a particularly small what?
Table 2: Type of Anomaly (n=62) Type of Anomaly Frequency Hydrocephalus 16 Anencephaly 14 Meningomyelocele 4 Encephalocele 6 CNS Anomalies, [49 (79%)] Hydroceph+meningomylocele 4 Anenceph+spinabifida 2Isolated Microcephalous 1Anomalies, [57(91.