noun
Old World monkey; cercopithecoid; guenon
Refers to any monkey of the family Cercopithecidae, especially the guenons (genus Cercopithecus). Typically used in zoological contexts.
動物園でオナガザルの群れを見た。
I saw a troop of Old World monkeys at the zoo.
Compound of 尾長 (onaga, 'long-tailed') + 猿 (saru, 'monkey'), referring to the long tail characteristic of many species in this group.