זִיהוּם m. (זָהַם) 1) the covering of plants with rancid oil, or tying up with manure (v. זָהַם). Ab. Zar. 50ᵇ ז׳ אוקומי וכ׳ ziham is a means of preserving the tree, v. ברי I ch. —2) offensive, turbid substance. Nidd. 65ᵇ, v. זָהַם. —3) social disqualification, spot in the family record (not subject to legal disqualification). Y. Yeb. X, 11ᵃ אין לה אלא משום ז׳ כהונה וכ׳ there is nothing against her except a social disqualification for priesthood, but the court cannot declare her &c., v. זָהַם; ib. XIII, 13ᵈ bot. אין בה וכ׳; Y. Gitt. VIII, 49ᶜ bot. אין בה משום ייחוס כהונה (corr. acc.).