--noun

1. an androgenic compound contained in drugs that are used to treat testosterone deficiency and female breast cancer and to stimulate growth and weight gain.

Methyltestosterone is a synthetic, orally active anabolic-androgenic steroid which is used in the treatment of androgen deficiency in males and for a number of other indications. It is also used illicitly for physique- or performance-enhancing purposes by athletes and bodybuilders.