1. (n.) A thin cake made of flour and other ingredients.

2. (n.) A thin cake or piece of bread (commonly unleavened, circular, and stamped with a crucifix or with the sacred monogram) used in the Eucharist, as in the Roman Catholic Church.

3. (n.) An adhesive disk of dried paste, made of flour, gelatin, isinglass, or the like, and coloring matter, -- used in sealing letters and other documents.

4. (v. t.) To seal or close with a wafer.

Brussels biscuit Communion Eucharist Holy Communion Host Last Supper Melba toast Sacrament Sunday altar bread biscuit bread bread and wine coat coating collop consecrated bread consecrated elements consubstantiation covering cracker cut deal disk elements feuille film flap foil fold graham cracker gruel hardtack impanation intinction lamella lamina laminated glass laminated wood lap lath leaf loaf membrane mere shadow pane panel paper patina peel pellicle pilot biscuit plait plank plate plating ply plywood pretzel rail rake rasher real presence rusk safety glass saltine scum sea biscuit shadow shaving sheet ship biscuit sinker skeleton skin slab slat slice slip soda cracker soup splinter streak subpanation table tablet the Holy Sacrament the Sacrament transubstantiation vein veneer zwieback