macrocephalus
/ˌmakrə(ʊ)ˈsɛfələs/ /ˌmakrə(ʊ)ˈsɛf(ə)ləs/ /ˌmakrə(ʊ)ˈkɛfələs/noun
1In plural (in form Macrocephali). A supposed Asian or Scythian tribe or people who characteristically had unusually long heads; (in singular) a member of this tribe. See long head. Now historical.
2 Medicine. A fetus with macrocephaly (now rare, perhaps obsolete ); macrocephaly; an instance of this.
Origin
Late 16th century; earliest use found in John Banister (1532/3–?1610), surgeon. From classical Latin macrocephalus (in Macrocephalī, plural, name of a tribe (Pliny))from ancient Greek μακροκέϕαλος ‘long-headed’ from μακρός + -κέϕαλος.