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

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Within a year, the lawyer’s daughter had begun a course of testosterone. Abigail Shrier, WSJ, "When Your Daughter Defies Biology," 6 Jan. 2019 In other cases, some women with a condition that exposed them to high levels of testosterone before birth identify as male — but many more with the same condition do not. Denise Grady, The Seattle Times, "Anatomy does not determine gender, experts say," 22 Oct. 2018 Then there’s the thorny matter of how medical professionals talk about Leah’s condition, which causes the body to make an excess of testosterone. Sophie Saint Thomas, SELF, "Your Guide to Finding a Doctor Who Is an LGBTQ+ Ally," 14 Sep. 2018 Getting good quality sleep seems to be important for maintaining testosterone levels in men. Yvette D'entremont, SELF, "I'm a Scientist With Insomnia So I Researched How to Actually Get Better Sleep," 28 Nov. 2018 Most commonly, this loss of bone density occurs due to hormonal changes that accompany aging: lower estrogen levels in women post-menopause and decreasing testosterone levels in men over the age of 70. Farah Naz Khan, Vox, "Doctors are blasé about bone health and it’s leading to more broken bones in the elderly," 30 July 2018 How do testosterone or estrogen or other anabolic steroids solve this problem? Umair Irfan, Vox, "Olympic swimmer Ryan Lochte broke doping rules. It happens far more than you think.," 24 July 2018 That might have been adolescence or testosterone or whatever the f*ck was running through my body at the time. Kelsey Stiegman, Seventeen, "A Definitive Timeline of Gigi Hadid and Zayn Malik's Relationship," 5 July 2018 According to an article published in the journal Medical Hypotheses, which reviewed 41 studies, hormones like testosterone and insulin-like growth factor are reduced under sleep-deprived conditions. Alexa Tucker, SELF, "4 Habits That Can Take Your Fitness Routine From Good to Great, According to Gunnar Peterson," 8 Feb. 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.

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First Known Use of testosterone

1935, in the meaning defined at sense 1

History and Etymology for testosterone

testis + -o- + -sterone

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Dictionary Entries near testosterone

test oath




test pattern

test pilot

test pit

Statistics for testosterone

Last Updated

15 Jan 2019

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Time Traveler for testosterone

The first known use of testosterone was in 1935

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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

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a complex dispute or argument

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