[tahy-tan-uh-sawr, tahyt-n-uh-]
any amphibious plant-eating dinosaur of the genus Titanosaurus, from the Cretaceous Period, having a long, thin neck and a long, whiplike tail.

1890–95; < Neo-Latin Titanosaurus. See Titan, -o-, -saur

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World English Dictionary
titanosaur (taɪˈtænəˌsɔː)
any of various herbivorous quadrupedal dinosaurs of the family Titanosauridae, of Jurassic and Cretaceous times: suborder Sauropoda (sauropods)
[C19: from New Latin Tītānosaurus, from Greek Titan + -saur]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
titanosaur   (tī-tān'ə-sôr', tīt'n-)  Pronunciation Key 
Any of various very large sauropod dinosaurs of the group Titanosauria of the Cretaceous Period. The titanosaurs were the last group of sauropods to evolve and probably include the largest sauropods ever (belonging to the genus Argentinosaurus). Some specimens were armored with bony plates.
The American Heritage® Science Dictionary
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