rhesus monkey

rhe·​sus monkey | \ ˈrē-səs- \

Definition of rhesus monkey

: a pale brown Asian macaque (Macaca mulatta) often used in medical research

called also rhesus, rhesus macaque

Examples of rhesus monkey in a Sentence

Recent Examples on the Web

A decade later, Tulane University transplant surgeon Keith Reemtsma placed both kidneys from a rhesus monkey into a 32-year-old-woman in renal failure. Joshua Mezrich, WSJ, "Losing the Humanity of Transplants," 18 Jan. 2019 In one study on 76 rhesus monkeys that’s been running since 1989 at the Wisconsin National Primate Research Center, monkeys on a 30 percent calorie cut lived, on average, two to three years longer than control monkeys. Mark Barna, Discover Magazine, "Not So Fast," 24 Sep. 2018 Another ongoing study, started in 1987 by the National Institute on Aging on 121 rhesus monkeys, hasn’t detected the same boost to longevity. Mark Barna, Discover Magazine, "Not So Fast," 24 Sep. 2018 In the 1950s, the American psychologist Harry Harlow took young rhesus monkeys from their mothers and found that the youngsters became reclusive. Benedict Carey, New York Times, "A Troubling Prognosis for Migrant Children in Detention: ‘The Earlier They’re Out, the Better’," 18 June 2018 But recent laboratory tests found that rhesus monkeys were far more likely to survive high doses of radiation if injected with Leukine 48 hours after exposure. BostonGlobe.com, "The week in business," 9 June 2018 Researchers have found that male rhesus monkeys who tend to shun group play, mutual grooming and other social activities have a subtle thing in common with boys who have an autism spectrum disorder. Melissa Healy, latimes.com, "Is vasopressin what's lacking in the brains of those with autism?," 3 May 2018 His team recently completed a 25-year study of calorie restriction in rhesus monkeys. Megan Molteni, WIRED, "Will Cutting Calories Make You Live Longer?," 22 Mar. 2018 Back in 1999, scientists cloned a rhesus monkey named Tetra using a method called embryo-splitting, which is easier to execute than SCNT but cannot generate as many offspring. Brigit Katz, Smithsonian, "Scientists Successfully Clone Monkeys, Breaking New Ground in a Controversial Field," 25 Jan. 2018

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'rhesus monkey.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

See More

First Known Use of rhesus monkey

1829, in the meaning defined above

History and Etymology for rhesus monkey

New Latin Rhesus, genus of monkeys, from Latin, a mythical king of Thrace, from Greek Rhēsos

Keep scrolling for more

Learn More about rhesus monkey

Share rhesus monkey

Dictionary Entries near rhesus monkey



Rhesus factor

rhesus monkey




Statistics for rhesus monkey

Last Updated

2 Feb 2019

Look-up Popularity

Time Traveler for rhesus monkey

The first known use of rhesus monkey was in 1829

See more words from the same year

Keep scrolling for more

More Definitions for rhesus monkey

rhesus monkey


English Language Learners Definition of rhesus monkey

: a small monkey that is often used in medical research

rhesus monkey


Medical Definition of rhesus monkey

: a pale brown Asian monkey of the genus Macaca (M. mulatta) often used in medical research

More from Merriam-Webster on rhesus monkey

Britannica.com: Encyclopedia article about rhesus monkey

Comments on rhesus monkey

What made you want to look up rhesus monkey? Please tell us where you read or heard it (including the quote, if possible).


a servile follower or underling

Get Word of the Day daily email!

Test Your Vocabulary

What did you just call me?! A Quiz

  • rows-of-various-emoji
  • If a member of the audience describes your speech as bombastic, does that person mean it is:
How Strong Is Your Vocabulary?

Test your vocabulary with our 10-question quiz!


Test Your Knowledge - and learn some interesting things along the way.


Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!