- a huge herbivorous dinosaur of the genus Diplodocus, from the Late Jurassic Epoch of western North America, growing to a length of about 87 feet (26.5 meters).
- any herbivorous quadrupedal late Jurassic dinosaur of the genus Diplodocus, characterized by a very long neck and tail and a total body length of 27 metres: suborder Sauropoda (sauropods)
