Apatosaurus

apatosaurus
apatosaurus (ə-pāt’ə-sôr’əs) or apatosaur
(ə-pāt’ə-sôr’əs)
a very large sauropod dinosaur of the genus apatosaurus (or brontosaurus) of the late jur-ssic period. apatosaurs had a long neck and tail and a relatively small head. see note at brontosaurus.
historical examples

this was about thirty feet long, and is known as apatosaurus grandis.
extinct monsters h. n. hutchinson