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From The Collaborative International Dictionary of English v.0.48:
Wanderoo \Wan`der*oo"\, 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]