The Collaborative International Dictionary of English v.0.48:

Sable \Sa"ble\, a.
   Of the color of the sable's fur; dark; black; -- used chiefly
   in poetry.
   [1913 Webster]

         Night, sable goddess! from her ebon throne,
         In rayless majesty, now stretches forth
         Her leaden scepter o'er a slumbering world. --Young.
   [1913 Webster]

   Sable antelope (Zool.), a large South African antelope
      (Hippotragus niger). Both sexes have long, sharp horns.
      The adult male is black; the female is dark chestnut
      above, white beneath.

   Sable iron, a superior quality of Russia iron; -- so called
      because originally stamped with the figure of a sable.

   Sable mouse (Zool.), the lemming.
      [1913 Webster]

WordNet (r) 3.0 (2006):

sable antelope
    n 1: large black East African antelope with sharp backward-
         curving horns [syn: sable antelope, Hippotragus niger]