NCI Dictionary of Cancer Terms

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The NCI Dictionary of Cancer Terms features 7,777 terms related to cancer and medicine.

Browse the dictionary by selecting a letter of the alphabet or by entering a cancer-related word or phrase in the search box.

penis
(PEE-nis)
An external male reproductive organ. It contains a tube called the urethra, which carries semen and urine to the outside of the body.

EnlargeAnatomy of the male reproductive and urinary systems; drawing shows the bladder, prostate gland, penis, urethra, testicle, and rectum.

Anatomy of the male reproductive and urinary systems showing the prostate, penis, testicles, bladder, and other organs.