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brachiosaur

[brey-kee-uh-sawr, brak-ee-] /ˈbreɪ ki əˌsɔr, ˈbræk i-/
noun
1.
a huge sauropod dinosaur of the genus Brachiosaurus, having a small head with nostrils on a knob above the eyes, long forelegs, and a sloping, massive body, and reaching a length of about 80 feet (24 meters).
Origin
< Neo-Latin Brachiosaurus (1903); see brachio-, -saur; so named in allusion to the unusual length of the humerus relative to the femur
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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brachiosaur in Science
brachiosaurus (brā'kē-ə-sôr'əs) or brachiosaur
  (brā'kē-ə-sôr'əs)   
A very large sauropod dinosaur of the genus Brachiosaurus of the Jurassic and Cretaceous Periods. It had forelegs that were longer than its hind legs, and nostrils on top of its head.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Encyclopedia Article for brachiosaur

any member or relative of the dinosaur genus Brachiosaurus, which lived 150 million to 130 million years ago from the Late Jurassic to the Early Cretaceous Period. Brachiosaurs were the heaviest and tallest sauropod dinosaurs for which complete skeletons exist; larger fossil bones belonging to other (and possibly related) sauropods have been found, but these specimens are incomplete. Fossilized remains of brachiosaurs are found in Africa, North America, and Europe.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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