| Octopus (n.) A genus of eight-armed cephalopods, including numerous species, some of them of large size. See Devilfish,. Thesaurus Entries Loch Ness monster, alevin, benthon, benthos, cetacean, crustacean, dolphin, dugong, fingerling, fish, fry, game fish, grilse, harbor seal, kipper, man-eater, man-eating shark, manatee, minnow, minny, nekton, octopus, panfish, plankton, porpoise, salmon, sea dog, sea lion, sea monster, sea pig, sea serpent, sea snake, sea urchin, seal, shark, shellfish, smolt, sponge, squid, tropical fish, walrus, whale |