1
medical
: a substance (called a hormone) that occurs naturally in men and male animals
Note: Testosterone causes the development of the male reproductive system and characteristics of the adult male body.
2
informal + often disapproving
: qualities (such as noticeable strength and aggressiveness) that agree with traditional ideas about what men are like
a testosterone-fueled television show
Cite this Entry
“Testosterone.” Merriam-Webster.com Simple Definition, Merriam-Webster, https://www.merriam-webster.com/simple/testosterone. Accessed 23 Jun. 2026.
Copy Citation
