- A people reported by Herodotus and Josephus to have no or removable heads.
- (Ecclesiastical History): The Eutychians, a Christian sect in the year 482 without a leader. See .
- (Ecclesiastical History): Bishops and certain clergymen not under regular diocesan control.
- A class of levelers in the time of King Henry I.
- plural form of acephalus
Late Latin, plural of acephalus. See acephal