Diplodocus

n. huge plant-eating dinosaur of the late Jurassic period with four legs and a long and thin neck that inhabited western North America

Diplodocus (pronounced , or ) is a genus of diplodocid sauropod dinosaur whose fossils were first discovered in 1877 by S. W. Williston. The generic name, coined by Othniel Charles Marsh in 1878, is a Neo-Latin term derived from Greek  (diploos) "double" and (dokos) "beam", in reference to its double-beamed chevron bones located in the underside of the tail. These bones were initially believed to be unique to Diplodocus; however, they have since then been discovered in other members of the diplodocid family and in non-diplodocid sauropods such as Mamenchisaurus. It lived in what is now western North America at the end of the Jurassic Period. Diplodocus is one of the more common dinosaur fossils found in the Upper Morrison Formation, a sequence of shallow marine and alluvial sediments deposited about 150 to 147 million years ago, in what is now termed the Kimmeridgian and Tithonian stages. The Morrison Formation records an environment and time dominated by gigantic sauropod dinosaurs such as Camarasaurus, Barosaurus, Apatosaurus and Brachiosaurus.
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Noun
1. huge quadrupedal herbivore with long neck and tail; of late Jurassic in western North America
(hypernym) dinosaur
(member-holonym) genus Diplodocus

DIPLODOCUS carnegii
Diplodocus was a huge creature with an extremely long neck and a long whip like tail. The name Diplodocus means "double beam" and describes a special feature of the backbone. Most of this herbivorous animals length was in the neck and tail. It lived in marshy regions where it could take refuge from predators if the need arose.
TIME - 150MYA, Late Jurassic period.
RANGE - USA Colorado, Montana, Utah and Wyoming.
SIZE - Averaged 88ft (27m).
WEIGHT - 11 US tons.
see time period

DIPLODOCO