Definition of apatosaur in US English:

apatosaur

(also apatosaurus)

noun

  • A huge herbivorous dinosaur of the late Jurassic period, with a long neck and tail.

    Genus Apatosaurus (popularly Brontosaurus), infraorder Sauropoda, order Saurischia

    Also called brontosaur
    • ‘He said continuing research into the species is important because of larger evolutionary questions, including their relationship to the much larger sauropod dinosaurs, including brachiousaurus and apatosaurus.’
    • ‘As Christians who reject evolutionary theory, the family scoffed at the park's dinosaur attractions, which date the apatosaurus, brachiosaurus and the like to prehistoric times.’
    • ‘And one of the marvelous things God described to Job sounds very much like an apatosaurus.’

Origin

Modern Latin, from Greek apatē ‘deceit’ + sauros ‘lizard’.

Pronunciation

apatosaur

/əˈpatōsôr/