Definition of green monkey
: a long-tailed monkey of any of several African subspecies of a guenon (Cercopithecus aethiops synonym Chloroebus aethiops) having greenish-appearing hair and often used in medical research
— called also vervet
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Merriam-Webster unabridged
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Time Traveler for green monkey
The first known use of green monkey was in 1758
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