- any of a class of steroid hormones that regulate the growth and function of the reproductive organs or stimulate the development of the secondary sexual characteristics.
- an animal hormone affecting development and growth of reproductive organs and related parts
- Any of various steroid hormones, such as estrogen and androgen, affecting the growth or function of the reproductive organs and the development of secondary sex characteristics.
- Any of various steroid hormones that regulate the sexual development of an organism and are needed for reproduction. Testosterone and estrogen are sex hormones.