{ ‖ } 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 ]