testosterone: the biologically most potent of the naturally occurring androgens, measurable in blood plasma and urine. It is produced chiefly by the testis from its precursor hormone, progesterone. In females testosterone is the precursor of estrogen in the ovaries. See also progesterone.

Dictionary of Sexology Project: Main Index

C₁₉H₂₈O₂

An androgen that is responsible for the development of male characteristics, as well as inducing stereotypical male behavior such as aggression, among other things. Like other steroids, synthetic testosterone is sometimes abused. In its pure form, it is crystalline.