חִיסּוּם, חִסּ׳ II m. (חָסַם II) [finish, polish,] 1) the steel-coating of cutting tools, steel-edge (cmp. אִסְטְמָא). Kel. XIII, 4 נטל חִיסּוּמָן if their steel-edge is worn off. —2) varnish, coating, uppermost layer. Y. Ber. IX, 14ᵃ אין הארץ … לפי חִיסּוּמָה the earth drinks (absorbs the rain) only as far as its upper layer (crust) goes; Y. Taan. I, 64ᵇ; Gen. R. s. 13, end; a. e.—Tosef. Ukts. II, 4 (T’bul Yom) ח׳ העליון (ed. Zuck. סל) the uppermost layer of the bone.