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Androgen: A male sex hormone that promotes the development and maintenance of the male sex characteristics. The major androgen is testosterone.
For androgens as natural hormones, see Androgen. Anabolic steroids, also known more properly as anabolic-androgenic steroids (AAS), are steroidal androgens that include natural androgens like testosterone as well as synthetic substances that are structurally related and have similar effects to testosterone. They are anabolic and increase protein within cells, especially in skeletal muscles.