A genus of eight-armed cephalopods, including numerous species, some of them of large size. See Devilfish,
- Any of numerous carnivorous marine mollusks of the genus Octopus or related genera, found worldwide. The octopus has a rounded soft body, eight tentacles with each bearing two rows of suckers, a large distinct head, and a strong beaklike mouth. Also called devilfish.
- Something, such as a multinational corporation, that has many powerful, centrally controlled branches.