sealing wax(n = noun.artifact) seal - fastener consisting of a resinous composition that is plastic when warm; used for sealing documents and parcels and letters;
is a kind of fastener, fastening, fixing, holdfast

   A compound of the resinous materials, pigments, etc., used as a material for seals, as for letters, documents, etc. [1913 Webster]

N  resin, rosin, gum, lac, sealing wax, amber, ambergris, bitumen, pitch, tar, asphalt, asphaltum, camphor, varnish, copal, mastic, magilp, lacquer, japan, artificial resin, polymer, ion-exchange resin, cation-exchange resin, anion exchange resin, water softener, Amberlite, Dowex, Diaion, resiny, resinous, bituminous, pitchy, tarry, asphaltic, asphaltite.

ader wax, bayberry wax, candelilla wax, carnauba wax, earth wax, epilating wax, fig wax, floor wax, ghedda wax, gondang wax, japan wax, lac wax, mineral wax, montan wax, paraffin wax, pisang wax, scale wax, sealing, sealing material, shellac wax, ski wax, vegetable wax, wax, wax and wane, wax bean, wax begonia, wax crayon, wax figure, wax insect, wax light, wax mallow, wax moth, wax myrtle, wax palm, wax paper, wax plant, white wax tree