testosterone

noun

tes·​tos·​ter·​one te-ˈstä-stə-ˌrōn How to pronounce testosterone (audio)
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
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
This was reportedly linked to naturally high testosterone levels that CAF claimed were higher than the federation’s limit. Tamerra Griffin, New York Times, 11 July 2025 Relatively more testosterone floating around in your system can cause your hair follicles to shrink over time, Dr. Engelman says. Erica Sloan, SELF, 9 July 2025 Up to a third of men receiving testosterone therapy don’t meet the official clinical criteria for testosterone deficiency. Dr. Jamin Brahmbhatt, CNN Money, 8 July 2025 They are also known to be endocrine disruptors, chemicals that interfere with our endocrine systems, which control the body’s hormones—such as insulin, testosterone, and estrogen—and numerous bodily functions, including metabolism and blood sugar regulation. Ani Freedman, Fortune, 26 June 2025 See All Example Sentences for testosterone

Word History

Etymology

borrowed from German Testosteron, from Latin testēs testes + German -o- -o- + -steron -sterone

Note: The name was introduced by the Hungarian pharmacologists Karoly Gyula David (1905-45) and János Freud (1901-48), the Dutch endocrinologist Elisabeth Dingemanse (1886-1952), and the German-born Dutch physician and pharmacologist Ernst Laqueur (1880-1947) (all affiliated with the Pharmaco-Therapeutic Laboratory of the University of Amsterdam) in "Über krystallinisches männliches Hormon aus Hoden (Testosteron), wirksamer als aus Harn oder aus Cholesterin bereitetes Androsteron," Zeitschrift für physiologische Chemie, Band 233 (1935), pp. 281-83.

First Known Use

1935, in the meaning defined at sense 1

Time Traveler
The first known use of testosterone was in 1935

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Cite this Entry

“Testosterone.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/testosterone. Accessed 14 Jul. 2025.

Kids Definition

testosterone

noun
tes·​tos·​ter·​one te-ˈstäs-tə-ˌrōn How to pronounce testosterone (audio)
: a male hormone produced by the testes that causes the development of the male reproductive system and secondary sex characteristics

Medical Definition

testosterone

noun
tes·​tos·​ter·​one te-ˈstäs-tə-ˌrōn How to pronounce testosterone (audio)
: 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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