Source : Webster's Revised Unabridged Dictionary (1913)

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.

   {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:

            Gloria factorum temere conceditur horum.

Source : WordNet®

leonine
     adj : of or characteristic of or resembling a lion