UrsprungLearned borrowing from Latin pēnis.
Formerpenis(indefinite, nominative, singular) · penis(genitive, indefinite, singular) · penisen(definite, nominative, singular) · penis(definite, nominative, singular) · penisens(definite, genitive, singular) · penis(definite, genitive, singular) · penisar(indefinite, nominative, plural) · penisars(genitive, indefinite, plural) · penisarna(definite, nominative, plural) · penisarnas(definite, genitive, plural)