Webster's Revised Unabridged Dictionary · 1913

Baboon

Baboon ({not transcribed}) , noun

[Old English babewin, baboin, from French babouin, or Late Latin babewynus. Of unknown origin; compare Dutch baviaan, German pavian, baboon, French babine lip of ape, dogs, etc., dial. German bappe mouth.]

(Zoology) One of the Old World Quadrumana, of the genera Cynocephalus and Papio; the dog-faced ape. Baboons have dog-like muzzles and large canine teeth, cheek pouches, a short tail, and naked callosities on the buttocks. They are mostly African. See Mandrill, and Chacma, and Drill an ape.