noun, plural diplodocuses.
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).

< Neo-Latin (1878), equivalent to diplo- diplo- + Greek dokós beam, bar, shaft

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World English Dictionary
diplodocus (dɪˈplɒdəkəs, ˌdɪpləʊˈdəʊkəs)
n , pl -cuses
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)
[C19: from New Latin, from diplo- + Greek dokos beam]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

1884, coined in Mod.L. by O.C. Marsh (1878) from Gk. diploos "double" + dokos "a beam."
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
diplodocus   (dĭ-plŏd'ə-kəs)  Pronunciation Key 
A very large herbivorous dinosaur of the genus Diplodocus of the late Jurassic Period. Diplodocus had a long, slender neck and tail and a small head with peglike teeth, and could grow to nearly 27 m (90 ft) in length. Fossilized skin impressions show that it probably had dermal spines along its back. Diplodocus is one of the longest known sauropod dinosaurs.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
When he searched for these characteristics on diplodocus skulls, he found none.
As you arrive, your first vision will be the giant cast of a diplodocus looming down above you.
Posture the depiction of diplodocus posture has changed considerably over the years.
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