‖n. [ NL., fr. Gr. 'hw`s dawn + say^ros lizard. ] (Paleon.) An extinct marine reptile from the coal measures of Nova Scotia; -- so named because supposed to be of the earliest known reptiles. [ 1913 Webster ]

{ ‖ } n. [ NL. hylaeosaurus, fr. Gr. &unr_; belonging to a forest (fr. &unr_; wood) + &unr_; a lizard. ] (Paleon.) A large Wealden dinosaur from the Tilgate Forest, England. It was about twenty feet long, protected by bony plates in the skin, and armed with spines. [ 1913 Webster ]

n. [ NL., fr. Gr. palaio`s ancient + say^ros a lizard. ] (Paleon.) A genus of fossil saurians found in the Permian formation. [ 1913 Webster ]

‖n. [ NL., fr. Gr. &unr_; complete, perfect + &unr_; a lizard. ] (Paleon.) A genus of extinct crocodilian reptiles of the Jurassic period, having a long and slender snout. [ 1913 Webster ]