Definition of macrocephalus in US English:



  • 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.

  • 2Medicine. A fetus with macrocephaly (now rare, perhaps obsolete); macrocephaly; an instance of this.


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.