Cephalopod from Greek kephalē (head) + pous (foot) = 'head-footed.' Coined by Cuvier in 1797. Connects the kephalē family (encephalitis, cephalic, hydrocephalus) to the enormous *ped- foot cluster (octopus, tripod, podium, platypus, antipodes, pedestrian).
Any marine mollusc of the class Cephalopoda, including octopuses, squids, cuttlefish, and nautiluses, characterised by arms or tentacles extending directly from the head.
From New Latin 'Cephalopoda,' the taxonomic order name coined by the French zoologist Georges Cuvier in 1797, from Greek 'κεφαλόπους' (kephalópous, head-footed), composed of 'κεφαλή' (kephalḗ, head) + 'πούς' (poús, foot). The PIE roots are *gʰebʰ-el- (head) for the first element and *ped- (foot) for the second. The name literally means 'head-footed' — the arms and tentacles
Aristotle was the first to recognise cephalopods as a distinct group in the 4th century BCE, noting their intelligence and colour-changing ability. Cuvier formalised this 2,100 years later in 1797 — yet the literal meaning 'head-foot' still perfectly captures what Aristotle observed: creatures whose arms sprout directly from their heads.