- any mollusk of the class Cephalopoda, having tentacles attached to the head, including the cuttlefish, squid, and octopus.
- belonging or pertaining to the Cephalopoda.
- any marine mollusc of the class Cephalopoda, characterized by well-developed head and eyes and a ring of sucker-bearing tentacles. The group also includes the octopuses, squids, cuttlefish, and pearly nautilus
- of, relating to, or belonging to the Cephalopoda
