a firm partly muscular partly glandular body that is situated about the base of the mammalian male urethra and that secretes an alkaline viscid fluid which is a major constituent of the semen
prostate
noun(pros-tate)
a protease secreted by epithelial cells of the prostate gland that is used in the diagnosis of prostate cancer since its concentration in blood serum tends to be proportional to the clinical stage of the disease —abbreviation PSA