tes·tos·ter·one | \ te-ˈstä-stə-ˌrōn \

Definition of testosterone 

1 : a hormone that is a hydroxy steroid ketone C19H28O2 produced especially by the testes or made synthetically and that is responsible for inducing and maintaining male secondary sex characters

2 : qualities (such as brawn and aggressiveness) usually associated with males : manliness

Examples of testosterone in a Sentence

Recent Examples on the Web

For those who got the testosterone, status consistently won out over power and quality. Melissa Healy, latimes.com, "An extra dose of testosterone increases men's preference for high-status luxury goods, study says," 4 July 2018 Baker explains that while both males and females get stressed, only the males produce testosterone. Kelly Murray, CNN, "These Aussie marsupials are having so much sex they are literally killing themselves," 15 May 2018 But when Landis tested positive for testosterone, the title was stripped and the team, which had been set to continue with a new sponsor, folded. Joe Lindsey, Outside Online, "Andy Rihs, Longtime Pro-Cycling Patriarch, Passes Away," 19 Apr. 2018 Experts believe that these lionesses have elevated levels of testosterone, which drives the development of manes in males, according to Karin Bruillard of the Washington Post. Brigit Katz, Smithsonian, "Bridget the Bearded Lioness Has Died at the Oklahoma City Zoo," 5 Apr. 2018 This suggested that something in the painkiller was causing problems in the testicles, and preventing them from producing testosterone. Madeleine Aggeler, The Cut, "Could Ibuprofen Impact Male Fertility?," 9 Jan. 2018 When exposed to levels of ibuprofen similar to that which would be taken orally, the testicle samples produced less testosterone after just 24 hours. Jamie Ducharme, Time, "Regular Ibuprofen Use May Contribute to Male Infertility, Study Says," 9 Jan. 2018 Hormonal birth control pills prove effective for many women, as has spironolactone, an androgen blocker that wards off certain hormones, like testosterone, which may contribute to acne. Lauren Hubbard, Harper's BAZAAR, "Everything You Need To Know To Get Rid of Acne Once And For All," 8 Aug. 2017 State says Bates broke medical standards by giving testosterone and thyroid hormones to some patients. Andrew Wolfson, The Courier-Journal, "Kentucky stops '25 Again' doctor from practicing hormone therapy," 21 June 2018

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

1935, in the meaning defined at sense 1

History and Etymology for testosterone

testis + -o- + -sterone

Keep scrolling for more

Learn More about testosterone

Share testosterone

Dictionary Entries near testosterone

test oath




test pattern

test pilot

test pit

Statistics for testosterone

Last Updated

10 Sep 2018

Look-up Popularity

Time Traveler for testosterone

The first known use of testosterone was in 1935

See more words from the same year

Keep scrolling for more

More Definitions for testosterone



English Language Learners Definition of testosterone

medical : a substance (called a hormone) that occurs naturally in men and male animals

: qualities (such as noticeable strength and aggressiveness) that agree with traditional ideas about what men are like


tes·tos·ter·one | \ te-ˈstäs-tə-ˌrōn \

Medical Definition of testosterone 

: a male hormone that is a crystalline hydroxy steroid ketone C19H28O2 produced primarily by the testes or made synthetically and that is the main androgen responsible for inducing and maintaining male secondary sex characteristics — see androgel, axiron

Keep scrolling for more

Comments on testosterone

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


by word of mouth

Get Word of the Day daily email!

Test Your Vocabulary

Name that Food Quiz

Spell It

Can you spell these 10 commonly misspelled words?

Word Winder's CrossWinder

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!