† Aceˈphalian,a.andn.Obs. [f.prec. + -an.] A.adj. Belonging to the ecclesiastical sect or party of the Acephali. B.n. A member of this sect. 1586T. Rogers 39 Art. (1607) 54 Detestable therefore is the error of the Acephalians, who denied the properties of the two natures in Christ.