-ceph·a·lus noun combining form Etymology: New Latin, from Greek -kephalos 1.plural-cephali: cephalic abnormality (of a specified type) < microcephalus > < hydrocephalus > 2.plural-cepha·li\-ˌlī\or-cepha·la\-_lə\: organism having a (specified) type of head < Ichthyocephali > < Phanerocephala >