abrachiocephalia a·bra·chi·o·ce·pha·li·a (ə-brā'kē-ō-sə-fā'lē-ə, -ā-brā'-) or a·bra·chi·o·ceph·a·ly (ə-brā'kē-ō-sěf'ə-lē) n. Congenital absence of the arms and head. Also called acephalobrachia.
