NCIt definition : A disorder characterized by decreased function of the gonads. Clinical manifestations
in both males and females include poor libido, infertility, and osteoporosis. Additional
signs in males include erectile dysfunction, muscle atrophy, gynecomastia and increased
abdominal fat. In females, additional signs include shrinking of the breasts and loss
of, or failure to develop menstruation.;
Alternative definition : NICHD: Decreased or absent production of sex steroids by the ovaries or testes.;