Source : Webster's Revised Unabridged Dictionary (1913)

Mandrill \Man"drill\, n. [Cf. F. mandrille, Sp. mandril, It.
   mandrillo; prob. the native name in Africa. Cf. {Drill} an
   ape.] (Zo["o]l.)
   a large West African baboon ({Cynocephalus, or Papio,
   mormon}). The adult male has, on the sides of the nose,
   large, naked, grooved swellings, conspicuously striped with
   blue and red.