a male, steroid sex hormone, CHO, produced as a white, crystalline substance by isolation from animal testes, or synthesized: used in medicine
See testosterone in American Heritage Dictionary 4
(tĕs-tŏsˈtə-rōnˌ)
noun
A white crystalline steroid hormone, C19H28O2, produced primarily in the testes and responsible for the development and maintenance of male secondary sex characteristics. It is also produced synthetically for use in medical treatment.