noun
- a male sex hormone produced primarily in the testicles that is responsible for the development of male characteristics
Usage: biology; medicine
Examples
- Testosterone levels naturally decline with age in men.
- The doctor ordered blood tests to check his testosterone levels.
- Testosterone is responsible for the development of facial hair during puberty.
- Some athletes illegally use synthetic testosterone to enhance performance.
- Low testosterone can cause fatigue and decreased muscle mass.
- The hormone testosterone plays a key role in bone density.