[ ə-păt′ə-sôrəs ]
apatosaur (ə-pătə-sôr′)

A very large sauropod dinosaur of the genus Apatosaurus (or Brontosaurus) of the late Jurassic Period. Apatosaurs had a long neck and tail and a relatively small head. See Note at brontosaurus.

Nearby words

  1. apathetic,
  2. apathia,
  3. apathism,
  4. apathy,
  5. apatite,
  6. apb,
  7. apc,
  8. ape,
  9. ape hangers,
  10. ape-man

The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

Examples from the Web for apatosaurus

  • This was about thirty feet long, and is known as Apatosaurus grandis.

    Extinct Monsters|H. N. Hutchinson