Holocephali

plural noun

Hol·o·ceph·a·li

¦hälō¦sefəˌlī,

¦hōl-

: a subclass of Chondrichthyes that is sometimes made a separate class, includes the recent chimaeras and certain chiefly extinct related fishes some of which date from Devonian time, and is distinguished by a cartilaginous skeleton, gill clefts covered by a fold of skin, high compressed head with small narrow mouth and the dentition reduced to broad flat plates, and a body tapering off into a long tail

holocephalous

¦⸗⸗¦sefələs

adjective