gland, prostate

gland, prostate A gland in the male reproductive system that is located just below the bladder. The prostate gland surrounds part of the urethra, the canal that empties the bladder. The prostate is composed of glandular tissue and bundles of smooth muscle. The prostate gland secretes a milky fluid that is discharged into the urethra at the time of ejaculation of semen and is part of semen. See also prostate enlargement; prostatitis.