Medical Definition of penis
plural pe·nes \ˈpē-(ˌ)nēz\play or pe·nis·es
: the male copulatory organ of a higher vertebrate animal that in mammals including humans usually functions as the channel by which urine leaves the body and is typically a cylindrical organ that is suspended from the pubic arch, contains a pair of large lateral corpora cavernosa and a smaller ventromedial corpus cavernosum containing the urethra, and has a terminal glans enclosing the ends of the corpora cavernosa, covered by mucous membrane, and sheathed by a foreskin continuous with the skin covering the body of the organ
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