Definition of microcephaly in English:


Pronunciation /ˌmīkrōˈsefəlē/ /ˌmaɪkroʊˈsɛfəli/


  • Abnormal smallness of the head, a congenital condition associated with incomplete brain development.

    ‘Congenital brain anomalies like microcephaly, abnormal cortical mantle formation, agenesis of the corpus callosum have been reported.’
    • ‘She has a number of complex conditions including congenital microcephaly and cerebral palsy.’
    • ‘However, three or more minor malformations, especially if associated with short stature or failure to thrive, microcephaly or developmental delay, should engender further investigation.’
    • ‘Some anthropologists have suggested that the hobbits could be modern-human dwarfs with a condition called microcephaly, a condition of abnormal smallness of the head.’
    • ‘If untreated, the disorder results in mental retardation, microcephaly, delayed speech, seizures, eczema and behavior abnormalities.’


Mid 19th century from micro- + Greek kephalē ‘head’ + -y.