The male erectile reproductive organ used for sexual intercourse that in the human male and other placental mammals is also used for urination; the tubular portion of the external male genitalia (excluding the scrotum).
The female clitoris is homologous to the male penis.
A similar erectile sexual organ present in the cloacas of male amniotes.
From late 17th century. Learned borrowing from Latin pēnis (“tail, penis”), from Proto-Indo-European *pes- (“penis”). Displaced native English pintle, tarse, pillicock.
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