n.
Masculinizing sex hormone produced by the testes .
It is responsible for the development of the male sex organs and secondary sex characteristics (e.g., facial hair, masculine musculature, deep voice, and male-pattern baldness). Testosterone can be manufactured by modifying other, less expensive steroid s. It is used in the treatment of hypogonadism, undescended testes (cryptorchism), and certain cancers.