testosterone

https://doi.org/10.1351/goldbook.11296

Androgenic steroid hormone produced primarily in the testis, responsible for the development of the male sexual organs and male secondary sexual characteristics.

Note: The ovary also secretes testosterone, but circulating levels in the female are much lower than in the male.
Source:
PAC, 2016, 88, 713. (Glossary of terms used in developmental and reproductive toxicology (IUPAC Recommendations 2016)) on page 812 [Terms] [Paper]