any of a genus (Pteranodon) of large, toothless, Late Cretaceous pterosaurs having a long, bony crest at the back of the head
See pteranodon in American Heritage Dictionary 4
noun
Any of several large pterosaurs of the genus Pteranodon of the Cretaceous Period, having a long pointed head, a scooplike beak, no teeth, and a wingspan upwards of 6 meters (20 feet).