rhesus monkey

rhe·​sus monkey | \ ˈrē-səs- How to pronounce rhesus monkey (audio) \

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

Visitors can find fish like gar and bluegill, several varieties of birds, turtles, alligators and even non-native rhesus monkeys that still live around the spring. Patrick Connolly, orlandosentinel.com, "Florida Springs Guide: Silver Springs State Park," 22 July 2019 Among rhesus monkeys like Orange and her troop, this expression is 100 percent unidirectional: It is given by the subordinate to the dominant, never the other way around. Frans De Waal, Discover Magazine, "Cheerful Chimps: Are Animals Really Happy When They Smile?," 31 May 2019 But at a minimum, the authors have shown the following: in both humans and rhesus monkeys, neurons in the cingulate cortex employ a richer neural code than neurons in the amygdala. Ryan Dalton, Scientific American, "Decoding the Language of Neurons," 2 July 2019 The vaccine also protected 67 percent of rhesus monkeys exposed to a simian virus similar to HIV, according to the researchers. Mark Barna, Discover Magazine, "State of Science: A New Weapon Against HIV," 1 Jan. 2019 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

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

Dictionary Entries near rhesus monkey



Rhesus factor

rhesus monkey




Statistics for rhesus monkey

Last Updated

3 Aug 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).


to move or obtain by small maneuvers

Get Word of the Day daily email!

Test Your Vocabulary

Summer 2019 Words of the Day Quiz

  • a-bowl-of-peach-sorbet-with-cut-peaches-next-to-it
  • Which is a synonym of desideratum?
True or False

Test your knowledge - and maybe learn something along the way.

Bee Cubed

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!