apatosaur

a·pat·o·saur  (-pt-sôr) or a·pat·o·sau·rus (-pt-sôrs)

n.

A very large herbivorous dinosaur of the genus Apatosaurus (formerly Brontosaurus) of the late Jurassic period, having a long neck and tail and a relatively small head.

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[New Latin Apatosaurus, unreal lizard, genus name : Greek apat, untruth, lie + Greek sauros, lizard.]

Thesaurus

Noun

1.

apatosaur - huge quadrupedal herbivorous dinosaur common in North America in the late Jurassic apatosaurus, Apatosaurus excelsus, brontosaur, brontosaurus, thunder lizard sauropod, sauropod dinosaur - very large herbivorous dinosaur of the Jurassic and Cretaceous having a small head a long neck and tail and five-toed limbs; largest known land animal genus Apatosaurus, genus Brontosaurus - large quadrupedal herbivorous dinosaurs with very long neck and tail; late Jurassic