The Collaborative International Dictionary of English v.0.48:

androgen \androgen\ n.
   1. a hormone, such as testosterone or androsterone, that
      promotes development and maintenance of typical male
      sexual characteristics. They are mostly produced in the
      testes.
      [WordNet 1.5 +PJC]

WordNet (r) 3.0 (2006):

androgen
    n 1: male sex hormone that is produced in the testes and
         responsible for typical male sexual characteristics [syn:
         androgen, androgenic hormone]