The Collaborative International Dictionary of English v.0.48:

Leopard \Leop"ard\ (l[e^]p"[~e]rd), n. [OE. leopart, leparde,
   lebarde, libbard, OF. leopard, liepart, F. l['e]opard, L.
   leopardus, fr. Gr. leo`pardos; le`wn lion + pa`rdos pard. See
   Lion, and Pard.] (Zool.)
   A large, savage, carnivorous mammal (Felis leopardus). It
   is of a yellow or fawn color, with rings or roselike clusters
   of black spots along the back and sides. It is found in
   Southern Asia and Africa. By some the panther (Felis
   pardus) is regarded as a variety of leopard.
   [1913 Webster]

   Hunting leopard. See Cheetah.

   Leopard cat (Zool.) any one of several species or varieties
      of small, spotted cats found in Africa, Southern Asia, and
      the East Indies; esp., Felis Bengalensis.

   Leopard marmot. See Gopher, 2.
      [1913 Webster]

WordNet (r) 3.0 (2006):

leopard
    n 1: the pelt of a leopard
    2: large feline of African and Asian forests usually having a
       tawny coat with black spots [syn: leopard, Panthera
       pardus]

Moby Thesaurus II by Grady Ward, 1.0:

47 Moby Thesaurus words for "leopard":
   Dalmatian, Leo, Siberian tiger, antigorite, bobcat, butterfly,
   candy cane, cat-a-mountain, catamount, chameleon, cheetah,
   chrysotile, confetti, cougar, crazy quilt, firedog, harlequin,
   iris, jaguar, lion, lynx, mackerel, mackerel sky, marble,
   marbled paper, moire, mother-of-pearl, mountain lion, nacre,
   ocelot, opal, ophite, painter, panther, patchwork quilt, peacock,
   puma, rainbow, serpentine, serpentine marble, shot silk, simba,
   spectrum, tiger, tortoise shell, wildcat, zebra



Easton's 1897 Bible Dictionary:

Leopard
   (Heb. namer, so called because spotted, Cant. 4:8), was that
   great spotted feline which anciently infested the mountains of
   Syria, more appropriately called a panther (Felis pardus). Its
   fierceness (Isa. 11:6), its watching for its prey (Jer. 5:6),
   its swiftness (Hab. 1:8), and the spots of its skin (Jer.
   13:23), are noticed. This word is used symbolically (Dan. 7:6;
   Rev. 13:2).