| Noun | 1. | cephalopod mollusk - marine mollusk characterized by well-developed head and eyes and sucker-bearing tentaclesmollusc, mollusk, shellfish - invertebrate having a soft unsegmented body usually enclosed in a shell Cephalopoda, class Cephalopoda - octopuses; squids; cuttlefish; pearly nautilus chambered nautilus, pearly nautilus, nautilus - cephalopod of the Indian and Pacific oceans having a spiral shell with pale pearly partitions octopod - a cephalopod with eight arms but lacking an internal shell decapod - cephalopods having eight short tentacles plus two long ones |