testis

noun
tes·​tis | \ ˈte-stəs How to pronounce testis (audio) \
plural testes\ ˈte-​ˌstēz How to pronounce testes (audio) \

Definition of testis

: a typically paired male reproductive gland that produces sperm and secretes testosterone and that in most mammals is contained within the scrotum at sexual maturity

Examples of testis in a Sentence

Recent Examples on the Web Only when the two are ready to mate will ovaries and egg-laying machinery populate the female’s genital tract, while the male sprouts testes. Katherine J. Wu, Smithsonian, "Alternatives to Heterosexual Pairings, Brought to You By Non-Human Animals," 28 June 2018 During a vasectomy, doctors cut or block the vas deferens, one of two tubes in the scrotum that carries sperm from the testes to the urethra, in two places. Dara T. Mathis, SELF, "We Need to Stop Acting Like Vasectomies Are Heroic," 29 Aug. 2019 The testes, almost alone among the organs that have been tested, don’t seem to have a clock either. Quanta Magazine, "How the Body’s Trillions of Clocks Keep Time," 15 Sep. 2015 Hormone-blocking treatment can include testes removal to reduce levels of testosterone, which fuels prostate cancer growth. Lindsey Tanner, BostonGlobe.com, "Dementia tied to hormone-blocking prostate cancer treatment," 5 July 2019 Chemical castration, which is very different from surgical castration or removal of the testes, serves to block the production of certain hormones, including testosterone. Laura Barcella, PEOPLE.com, "Child Sex Offenders Could Be ‘Chemically Castrated’ Under New Alabama Law," 5 June 2019 This also meant that testicondy evolved after afrotherians split from other placental mammals, about 100 million years ago, which suggests the common ancestor of all mammals did indeed lower their testes, Dr. Hiller said. New York Times, "The Evolutionary Origin of Descending Testicles," 29 June 2018 Within a matter of days, the new female will also begin to undergo some pretty stark physical transformations, growing rapidly in size as her testes recede back into her body. Katherine J. Wu, Smithsonian, "Alternatives to Heterosexual Pairings, Brought to You By Non-Human Animals," 28 June 2018 Some have the male chromosome but no testes, for example, and doctors can figure out the reason for these abnormalities in fewer than half of all cases. Elizabeth Pennisi, Science | AAAS, "The little piece of DNA that makes girls boys," 14 June 2018

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'testis.' 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 testis

1650, in the meaning defined above

History and Etymology for testis

Latin, witness, testis

Keep scrolling for more

Learn More about testis

Statistics for testis

Last Updated

2 Nov 2019

Time Traveler for testis

The first known use of testis was in 1650

See more words from the same year

Keep scrolling for more

More Definitions for testis

testis

noun
tes·​tis | \ ˈte-stəs How to pronounce testis (audio) \
plural testes\ ˈte-​ˌstēz \

Kids Definition of testis

: a male reproductive gland that produces sperm

testis

noun
tes·​tis | \ ˈtes-təs How to pronounce testis (audio) \
plural testes\ ˈtes-​ˌtēz How to pronounce testes (audio) \

Medical Definition of testis

: a typically paired male reproductive gland that usually consists largely of seminiferous tubules from the epithelium of which spermatozoa develop, that contains androgen-secreting Leydig cells in the interstitial tissue, that corresponds to the ovary of the female and in craniate vertebrates develops from the genital ridges of the embryo, and that in most mammals descends into the scrotum before the attainment of sexual maturity and in many cases before birth

More from Merriam-Webster on testis

Rhyming Dictionary: Words that rhyme with testis

Britannica.com: Encyclopedia article about testis

Comments on testis

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

WORD OF THE DAY

concealed or difficult to comprehend

Get Word of the Day daily email!

Test Your Vocabulary

Pass the Little Ribbons: A Pasta Word Quiz

  • rotelle pasta
  • Match the pasta to its meaning in English: Rotelle
Spell It

Can you spell these 10 commonly misspelled words?

TAKE THE QUIZ
Add Diction

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

TAKE THE QUIZ
Love words? Need even more definitions?

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