Source : Webster's Revised Unabridged Dictionary (1913)

Koala \Ko*a"la\, n.
   A tailless marsupial ({Phascolarctos cinereus}), found in
   Australia. The female carries her young on the back of her
   neck. Called also {Australian bear}, {native bear}, and
   {native sloth}.

Source : WordNet®

koala
     n : sluggish tailless Australian arboreal marsupial with gray
         furry ears and coat; feeds on eucalyptus leaves and bark
         [syn: {koala bear}, {kangaroo bear}, {native bear}, {Phascolarctos
         cinereus}]