Hy"lae*o*saur` (?), Hy`lae*o*sau"rus (?), n. [NL. hylaeosaurus, fr. Gr. belonging to a forest (fr. wood) + 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.
© Webster 1913.