אִסְתָּן, ch. m. (Ithp. of סן, v. סנן a. שנן)the clear or cold wind, hence north-wind, North. Keth. 23ᵃ; Kidd. 12ᵇ עדים בצד אסתן the witnesses are in the North (Babylon; v. Tosaf. ib. a. v. אוריא).—Targ. Job XXXVII, 22 Ms. (ed. אִסְתַּנְיָא); h. text זהב).—Ber. 59ᵃ אתא אסתנא וכ׳ (Ms. אי׳) the northwind comes and clears the sky. Erub. 65ᵃ a Talmudic decision must be as clear כיומא דא׳ as a northwind day; Meg. 28ᵇ. Sabb. 116ᵇ. Cmp. טִיהֲרָא.