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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.
Conversion to estrogen. It is this process and the production of male sperm, of course, that causes these hormones to be referred to as the sex hormones. However, testosterone is one of a number of androgens. Both androgens and estrogens are involved in a great many other processes. Estrogens and androgens are not uniquely male or female. What differs is the ratio between the two sexes.