шаб • (šab)
From Middle Persian [Term?], from Old Persian 𐎧𐏁𐎱𐎺 (xšap-), from Proto-Indo-European *k(ʷ)sep- (“night”). Cognate with Sanskrit क्षप् (kṣáp) and Avestan 𐬑𐬴𐬀𐬞𐬀𐬥 (xšapan).