Etymology
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diplodocus (n.)

genus of long-necked, long-tailed Jurassic dinosaurs, 1884, coined in Modern Latin in 1878 by U.S. paleontologist Othniel Charles Marsh (1831-1899) from Greek diploos "double" (see diplo-) + dokos "a bearing-beam," connected to dekomai "to take, accept, receive," as an agent-noun, so, properly, "which takes on (the load or covering)," from suffixed form of PIE root *dek- "to take, accept." The dinosaur was so called for the peculiar structure of the tail bones.

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Definitions of diplodocus

diplodocus (n.)
a huge quadrupedal herbivore with long neck and tail; of late Jurassic in western North America;
From wordnet.princeton.edu