Etymology

penis

pe·nis
P3E1N1I1S1

Today it means: 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). Full definition →

Latin pēni ← Proto-Italic *peznis ← Proto-Indo-European *pes-ni-s
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The story

  1. Proto-Indo-European*pes-
  2. Proto-Indo-European*pes-ni-s
  3. Proto-Italic*peznis
  4. Latinpēni
  5. English todaypenis

Learned borrowing from Latin pēnis, from Proto-Italic *peznis, from Proto-Indo-European *pes-ni-s, from *pes- (“penis”). First attested in the late 17th century. Displaced native English pintle, tarse, pillicock.

Etymology from Wiktionary, CC BY-SA 4.0.