поперёк

• поперёкъ (poperjók), поперѣ̈къ (poperjǒ́k) — Pre-reform orthography (1918)

From по- (po-) +‎ *перёк (*perjók, “crosswise”), from Proto-Slavic *perkъ. Underlying root found in Old East Slavic перекъ (perekŭ, “width, crossbeam”) as well as Belarusian пе́рек (pjérjek, “across”); Ukrainian пере́ка (peréka, “contradiction”); Church Slavonic прѣкꙑ (prěky, “across”); Bulgarian пря́ко (prjáko, “straight, across”); Serbo-Croatian при̏јек (“steep”); при̏јекӣ (“straight, nearest”); при̏јеко (“through”); Slovene prek (“across (adverb)”) (tonal orthography), also preko (tonal orthography); prèk (“across (preposition)”) (tonal orthography); Czech příka (“steepness”); příč (“width”); Slovak priek (“resistance”); Polish w poprzek (“across, crosswise”) or obsolete Polish przeko (“across”); Upper Sorbian prěki (“across”); Lower Sorbian pŕeki (“across”).

• IPA^(key): [pəpʲɪˈrʲɵk]

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поперёк • (poperjók) (+ genitive case)

1. across, athwart

поперёк • (poperjók)

1. across, crosswise

• пере́чить (peréčitʹ)
• попере́чник (poperéčnik)
• попере́чный (poperéčnyj)

• Vasmer, Max (1964–1973) “поперёк”, in Oleg Trubachyov, transl., Этимологический словарь русского языка [Etymological Dictionary of the Russian Language] (in Russian), Moscow: Progress
• Vasmer, Max (1964–1973) “-перёк”, in Oleg Trubachyov, transl., Этимологический словарь русского языка [Etymological Dictionary of the Russian Language] (in Russian), Moscow: Progress