a flying reptile of the extinct order Pterosauria, from the Cretaceous Period, having a wingspread of about 25 feet (8 meters).

< Neo-Latin, equivalent to pter- pter- + Greek anódōn toothless (see an-1, -odont) Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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American Heritage
Science Dictionary
pteranodon   (tə-rān'ə-dŏn')  Pronunciation Key 
Any of several very large, extinct flying reptiles (pterosaurs) of the genus Pteranodon of the Cretaceous Period. Pteranodon had a long pointed crest on its head, no teeth, a very short tail, and a wingspan upwards of 9 m (30 ft).
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