Reconstruction:Proto-Slavic/paportь

From reduplicated root *pa-por- +‎ *-tь with unexpected 'a', from Proto-Indo-European *(s)per- or maybe *p(t)erH-?.

Cognate with Lithuanian papártis, papar̃tis, papartу̃s (“fern”), Latvian papar̂de (“fern”), paparkste, paparksts (“fern”). Also Lithuanian spar̃nas (“wing”), Latvian spàrns (“wing”), Proto-Indo-Iranian *parnám (“wing, feather”) (> Sanskrit पर्ण (parṇám), Avestan 𐬞𐬀𐬭𐬆𐬥𐬀‎ n (par^əna)), Proto-Celtic *ɸratis (“fern”) (> Irish raith), Proto-West Germanic *farn (“fern”) (> English fern, Old High German farn).

For the meaning compare Czech čertí péro (“fern”), Ancient Greek πτερίς (pterís, “fern”) (< πτερόν (pterón, “wing”)).

*pàportь f

1. fern

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• *pero (“feather”)

• East Slavic:
  • Old East Slavic: папороть (paporotĭ)
    • Belarusian: па́параць (páparacʹ)
      • ⇒ Belarusian: па́паратнік (páparatnik)
    • Russian: па́пороть (páporotʹ)
      • ⇒ Russian: па́поротник (páporotnik)
    • Ukrainian: па́пороть (páporotʹ)
      • ⇒ Ukrainian: па́поротник (páporotnyk)
• South Slavic:
  • Bulgarian: папрат (paprat)
  • Macedonian: папрат (paprat)
  • Serbo-Croatian:

    Cyrillic script: па̏пра̄т

    Latin script: pȁprāt

  • Slovene: práprot (< *paprat/*praprat)
• West Slavic:
  • Old Czech: kapratie
    • Czech: kapraď (< *paprať)
  • Kashubian: parparc, parpac
  • Polabian: porport
  • Polish: paproć
  • Slovak: papraď, kapradie, papradie
  • Sorbian:
    • Lower Sorbian: paproś
    • Upper Sorbian: paproć

• Vasmer, Max (1964–1973), “па́пороть”, in Этимологический словарь русского языка [Etymological Dictionary of the Russian Language] (in Russian), transl. & suppl. by Oleg Trubachyov, Moscow: Progress
• Chernykh, P. Ja. (1993), “папоротник”, in Историко-этимологический словарь русского языка [Historical-Etymological Dictionary of the Russian Language] (in Russian), volume 2 (панцирь – ящур), 3rd edition, Moscow: Russian Lang., →ISBN, page 4