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 (parəna)), 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
singular | dual | plural | |
---|---|---|---|
nominative | *pàportь | *pàporti | *pàporti |
genitive | *pàportī | *pàportьju, *pàporťu* | *pàportьjь, *pàportī* |
dative | *pàporti | *pàportьma | *pàportьmъ |
accusative | *pàportь | *pàporti | *pàporti |
instrumental | *pàportьjǫ, *pàporťǭ* | *pàportьma | *pàportьmī |
locative | *pàportī | *pàportьju, *pàporťu* | *pàportьxъ |
vocative | *paporti | *pàporti | *pàporti |
* The second form occurs in languages that contract early across /j/ (e.g. Czech), while the first form occurs in languages that do not (e.g. Russian).