foil

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foil2 †leaf; thin sheet of metal XIV; thin leaf of metal placed under a precious stone to increase its brilliance, etc.; a thing that serves by contrast to set off another thing XVI.(i) — OF. foil :- L. folium leaf; (ii) — OF. foille (mod. feuille) :- L. folia, pl. of folium (n. pl. taken as fem. sg.).

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