The Collaborative International Dictionary of English v.0.48:

Leonine \Le"o*nine\ (l[=e]"[-o]*n[imac]n), a. [L. leoninus, fr.
   leo, leonis, lion: cf. F. l['e]onin. See Lion.]
   Pertaining to, or characteristic of, the lion; as, a leonine
   look; leonine rapacity. -- Le"o*nine*ly, adv.
   [1913 Webster]

   Leonine verse, a kind of verse, in which the end of the
      line rhymes with the middle; -- so named from Leo, or
      Leoninus, a Benedictine and canon of Paris in the twelfth
      century, who wrote largely in this measure, though he was
      not the inventor. The following line is an example:
      [1913 Webster]

            Gloria factorum temere conceditur horum.
      [1913 Webster]