1. Any substance that conduces to masculinization, such as the testicular hormone.
2. A substance, as a male sex hormone, capable of developing and maintaining certain male sexual characteristics.
3. Generic term for an agent, usually a hormone (e.g., androsterone, testosterone), that stimulates activity of the accessory male sex organs, encourages development of male sex characteristics, or prevents changes in the latter that follow castration; natural androgen’s are steroids, derivatives of androstane.

Relating to an androgen; having a masculinizing effect.

Hair follicles that exist on much of the human body (including some females) which respond to androgens (primarily testosterone and its derivatives).

Generally, the rate of hair growth increases and the thickness of the hairs increases in direct proportion to the androgen levels; however, different areas respond with different sensitivities.

As puberty progresses, the sequence of appearance of sexual (androgenic) hair reflects the gradations of androgen sensitivity. The pubic area is most sensitive, and heavier hair usually grows there first in response to androgens.