Borrowed from Old Church Slavonic поукъ (pukŭ), from Proto-Slavic *pǫkъ, from Proto-Indo-European *pank-. Compare Ukrainian пук (puk), Czech puk, Polish pęk.
Further cognates, per Vasmer, are Persian پنگ (pang, “date palm cluster”) and Latin pānus (“millet ear”).
пук • (puk) m inan (genitive пу́ка, nominative plural пуки́, genitive plural пуко́в)
пук • (puk) m inan (genitive пу́ка, nominative plural пу́ки, genitive plural пу́ков)
From earlier *puok, from older плк, from Proto-Slavic *pъlkъ, borrowed from Proto-Germanic *fulkaz.
пу̑к m (Latin spelling pȗk)
| singular | plural | |
|---|---|---|
| nominative | пу̑к | пу́кови / пу̑ци |
| genitive | пу̑ка | пу́кова / пу̑ка̄ |
| dative | пу̑ку | пу́ковима / пу̑цима |
| accusative | пу̑к | пу́кове / пу̑ке |
| vocative | пу̑че | пу́кови / пу̑ци |
| locative | пу̑ку | пу́ковима / пу̑цима |
| instrumental | пу̑ком | пу́ковима / пу̑цима |