Antilope dorcas

from The Collaborative International Dictionary of English v.0.48

Ariel \A"ri*el\, n., or Ariel gazelle \A"ri*el ga*zelle"\ [Ar.
   aryil, ayyil, stag.] (Zool.)
   (a) A variety of the gazelle ({Antilope dorcas}, or {Gazella,
       dorcas}), found in Arabia and adjacent countries.
   (b) A squirrel-like Australian marsupial, a species of
       {Petaurus}.
   (c) A beautiful Brazilian toucan {Ramphastos ariel}).
       [1913 Webster]