a large class of active predatory molluscs comprising octopuses, squids, and cuttlefish. They have a distinct head with large eyes and a ring of tentacles around a beaked mouth, and are able to release a cloud of inky fluid to confuse predators.
modern Latin (plural), from Greek kephalē 'head' + pous, pod- 'foot'
Cephalopoda in other Oxford dictionaries
Definition of Cephalopoda in the US English dictionary