ichthyosaur

[ik-thee-uh-sawr]
noun
any fishlike marine reptile of the extinct order Ichthyosauria, ranging from 4 to 40 feet (1.2 to 12 meters) in length and having a round, tapering body, a large head, four paddlelike flippers, and a vertical caudal fin.

Origin:
1820–30; see ichthyosaurus

ichthyosaurian, adjective, noun
ichthyosauroid, adjective
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
ichthyosaur or ichthyosaurus (ˈɪkθɪəˌsɔː, ˌɪkθɪəˈsɔːrəs)
 
n , pl -saurs, -sauruses, -sauri
See also plesiosaur any extinct marine Mesozoic reptile of the order Ichthyosauria, which had a porpoise-like body with dorsal and tail fins and paddle-like limbs
 
ichthyosaurus or ichthyosaurus (ˈɪkθɪəˌsɔː, ˌɪkθɪəˈsɔːrəs, -ˈsɔːraɪ)
 
n

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

Ichthyosaur
1830, coined from Gk. ichthys "fish" + sauros "lizard."
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
ichthyosaur   (ĭk'thē-ə-sôr')  Pronunciation Key 
Any of various extinct sea reptiles of the genus Ichthyosaurus and related genera, that had a medium-sized to large dolphin-like body with a dorsal fin, four flippers, and a large, crescent-shaped tail. The head had a long beak with sharp teeth, large eyes and earbones, and nostrils near the eyes on top of the skull. Ichthyosaurs were most common and diverse in the Triassic and Jurassic Periods and died out well before the end of the Cretaceous.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Encyclopedia Britannica
Encyclopedia

ichthyosaur

any member of an extinct group of aquatic reptiles, most of which were very similar to porpoises in appearance and habits. These distant relatives of lizards and snakes (lepidosaurs) were the most highly specialized aquatic reptiles, but ichthyosaurs were not dinosaurs.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
In the new show, though, it is the ichthyosaur's time to shine.
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