quetzalcoatlusPronunciation: /ˌkwɛts(ə)lkəʊˈatləs/Definition of quetzalcoatlus noun a giant pterosaur of the late Cretaceous period, which was the largest ever flying animal with a wingspan of up to 15 m. Genus Quetzalcoatlus, family Azhdarchidae, order Pterosauria Origin:modern Latin, from the name of the Aztec god Quetzalcóatlquetzalcoatlus in other Oxford dictionaries Definition of quetzalcoatlus in the US English dictionary