The Collaborative International Dictionary of English v.0.48:

Panthera \Panthera\ prop. n.
   The genus of large felines including the lions; leopards;
   snow leopards; jaguars; tigers; cheetahs; and saber-toothed
   tigers.

   Syn: genus Panthera.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

Panthera
    n 1: lions; leopards; snow leopards; jaguars; tigers; cheetahs;
         saber-toothed tigers [syn: Panthera, genus Panthera]