'aetosaur' originates from Greek, specifically the word 'aetos' meaning 'eagle' and 'sauros' meaning 'lizard'.

'aetosaur' was derived from the Greek words 'aetos' and 'sauros', and eventually became the modern English word 'aetosaur'.

Initially, it referred to a 'lizard with eagle-like features', but over time it evolved into its current meaning of a specific group of extinct reptiles.