testosterone
noun
tes·tos·ter·one te-ˈstä-stə-ˌrōn 
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
Example Sentences
Recent Examples on the Web My own experience of transitioning, of taking synthetic testosterone, is not all doom. 
Kole Fulmine, refinery29.com, 20 July 2022 For individuals who transition from female to male, taking testosterone will typically lower one’s voice by expanding their vocal cords. Courtney Tanner, The Salt Lake Tribune, 18 July 2022 Advocates point to the 2017 case of Mack Beggs, a high school wrestler who began taking testosterone while transitioning from female to male. David Wharton, Los Angeles Times, 20 June 2022 In October of last year, Loghan started taking testosterone to begin transitioning, Blake told Dateline. NBC News, 8 Feb. 2022 The project started when Philomene decided to take self-portraits every day to document their experience taking testosterone. The New Yorker, 30 Sep. 2021 Additionally, cats with similar microbiomes had more frequent contact with each other, and cats with higher testosterone levels were more likely to try to escape, per the study. Margaret Osborne, Smithsonian Magazine, 1 Aug. 2022 In a review of four trials, it was found that men who took ashwagandha had an increase in sperm concentration and motility, as well as a small increase in testosterone levels. Marisa Cohen, Good Housekeeping, 28 July 2022 Meanwhile, cats with higher testosterone levels were also more likely to try to escape the room where they were observed. Sarah Sloat, NBC News, 27 July 2022 See More
Kole Fulmine, refinery29.com, 20 July 2022 For individuals who transition from female to male, taking testosterone will typically lower one’s voice by expanding their vocal cords. Courtney Tanner, The Salt Lake Tribune, 18 July 2022 Advocates point to the 2017 case of Mack Beggs, a high school wrestler who began taking testosterone while transitioning from female to male. David Wharton, Los Angeles Times, 20 June 2022 In October of last year, Loghan started taking testosterone to begin transitioning, Blake told Dateline. NBC News, 8 Feb. 2022 The project started when Philomene decided to take self-portraits every day to document their experience taking testosterone. The New Yorker, 30 Sep. 2021 Additionally, cats with similar microbiomes had more frequent contact with each other, and cats with higher testosterone levels were more likely to try to escape, per the study. Margaret Osborne, Smithsonian Magazine, 1 Aug. 2022 In a review of four trials, it was found that men who took ashwagandha had an increase in sperm concentration and motility, as well as a small increase in testosterone levels. Marisa Cohen, Good Housekeeping, 28 July 2022 Meanwhile, cats with higher testosterone levels were also more likely to try to escape the room where they were observed. Sarah Sloat, NBC News, 27 July 2022 See More 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
Medical Definition
testosterone
noun
tes·tos·ter·one te-ˈstäs-tə-ˌrōn
: 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