wanderoo \wan`deroo"\, n. cingalese wanderu a monkey. zool.
   a large monkey macacus silenus native of malabar. it is
   black, or nearly so, but has a long white or gray beard
   encircling the face. called also maha, silenus,
   neelbhunder, lion-tailed baboon, and great wanderoo.
   written also ouanderoo.
   1913 webster

   note: the name is sometimes applied also to other allied
         species.
         1913 webster
see also:
macacus silenus maha silenus neelbhunder lion-tailed baboon great wanderoo 
ouanderoo