green monkey

American Heritage® Dictionary of the English Language, Fourth Edition

1. n. See vervet.

Wiktionary

1. n. An Old World monkey of the genus Chlorocebus.

GNU Webster's 1913

1. adj. (Zoöl.) a West African long-tailed monkey (Cercopithecus callitrichus), very commonly tamed, and trained to perform tricks. It was introduced into the West Indies early in the last century, and has become very abundant there.

WordNet 3.0

1. n. common savannah monkey with greenish-grey back and yellow tail