The male reproductive organ used for sexual intercourse that in the human male and some other mammals is also used for urination; the tubular portion of the male genitalia (excluding the scrotum).
"The doctor explained that during his checkup, he would need to examine the penis carefully."
In plain English: The penis is the male organ used for urination and reproduction.
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Usage: The word "penis" refers to the male external genitalia and should be used only when specifically discussing anatomy or biology. In casual conversation, it is often considered too clinical, so euphemisms are frequently preferred unless direct medical precision is required.
The word "penis" entered English in the late 17th century as a learned borrowing from Latin, where it originally meant both "tail" and "penis." It eventually replaced older native English terms like "pintle" and "pillicock" to become the standard name for the body part.