_:b668235663 . _:b668235663 "Gale:Gale_Encyclopedia_of_Medicine"^^ . _:b668235663 . _:b668235663 . _:b668235663 . _:b668235663 "Measurement of the physical form or structure of the prostate gland, the gland surrounding the male urethra just below the base of the bladder which secretes a fluid that constitutes a major portion of the semen."^^ .