The Collaborative International Dictionary of English v.0.48:

Hylaeosaur \Hy"l[ae]*o*saur`\, Hylaeosaurus
\Hy`l[ae]*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.
   [1913 Webster]