From an unused root meaning to hide; winter (as the dark season) -- winter.
H5638. sethav
סתו Kt, סְתָיו Qr noun masculine winter (loan-word from Aramaic; compare Syriac , סִיתְוָא ᵑ7; Arabic Lane1504; probably originally ׳שׂ, compare SchwIdioticon 64; on ו as old nominative ending (׳ס for šutayu) compare LagBN 190 Anm.); — עָבָ֑ר הַסְּתָ֯ו Song of Solomon 2:11.