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English word foil comes from Latin folium, and later Old French fueille (Leaf (of a plant).)
folium (Latin)
(figuratively) trifle, thing of no consequence. A leaf. A petal. A sheet or leaf of paper.
folia (Latin)
folia (Late Latin)
fueille (Old French)
Leaf (of a plant).
foille (Middle English)
foil (English)
(fencing) A very thin sword with a blunted (or foiled) tip. (figuratively) Anything that acts by contrast to emphasise the characteristics of something.. (figuratively) In literature, theatre/theater, etc., a character who helps emphasize the traits of the main character.. (heraldiccharge) A stylized flower or leaf.. (uncountable) Thin aluminium/aluminum (or, formerly, tin) used for wrapping [...]