Testosterone \Tes*tos"ter*one\ (t[e^]s*t[o^]s"t[~e]r*[=o]n), n.
[testes + o + sterone a steroid ketone.]
a steroid hormone ({C19H28O2}) produced mostly in the testes,
which is responsible for producing the secondary sexual
characteristics of males.
[PJC]