Jastrow: מִדָּף

מִדָּף m. (נָדַף) indirect contact by shaking, breathing &c. (cmp. מִדְרָס, הֶיסֵּט).—Esp. טומאת מ׳, or מ׳ the uncleanness of an object arising from an unclean person’s indirect contact; the object thus made unclean; uncleanness of a minor degree. Nidd. 4ᵃ ומ׳ (טמא) נתון תחתיו (Tosef. Toh. IV, 4 מדרס) and an object of minor uncleanness rests under it. Sifra M’tsorʿa, Zabim, ch. IV, Par. 3 עושה תחתיו מ׳ he makes the things under him (e. g. cushions directly under his head) unclean as a middaf; a. e.—Pl. מִדָּפוֹת laws concerning middaf. Y. Sot. V, 20ᵇ. Y. Dem. II, 23ᵃ top.—Y. Sabb. VII, 9ᵈ bot. מהו מ׳ מגעות what kind of middafoth? Contact.