cephalopodPronunciation: /ˈsɛf(ə)lə(ʊ)pɒd, ˈkɛ-/Definition of cephalopod noun Zoology an active predatory mollusc of the large class Cephalopoda, such as an octopus or squid. cephalopod in other Oxford dictionaries Definition of cephalopod in the US English dictionary