microencephalic
/ˌmʌɪkrəʊɛnsɪˈfalɪk/ /ˌmʌɪkrəʊɛnkɛˈfalɪk/(also micrencephalic) Chiefly Medicine
adjective
Characterized by or exhibiting microencephaly; having a small brain.
Origin
Mid 19th century; earliest use found in Robert Mayne (1808–1868). From micro- + encephalic R. G. Mayne gives a Latin form micrencephalicus.