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: a male organ of copulation containing a channel through which sperm leaves the body that in mammals including human beings also serves to discharge urine from the body. Note: The penis develops from the same embryonic mass of tissue as the clitoris. Britannica.com: Encyclopedia article about penis . Love words? Need even more definitions? Penis , the copulatory organ of the male of higher vertebrates that in mammals usually also provides the channel by which urine leaves the body. The corresponding structure in lower invertebrates is often called the cirrus. Learn about the anatomy and physiology of the penis . Definition of penis noun in Oxford Advanced Learner's Dictionary. Meaning , pronunciation, picture, example sentences, grammar, usage notes, synonyms and more. / ˈpi·nɪs / Add to word list an organ of male mammals that is used to excrete urine and for sex (Definition of penis from the Cambridge Academic Content Dictionary © Cambridge University Press)