Noun
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a light slender flexible sword tipped by a button
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picture consisting of a positive photograph or drawing on a transparent base
viewed with a projector
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a device consisting of a flat or curved piece (as a metal plate) so that its surface reacts to the water it is passing through
"the fins of a fish act as hydrofoils"
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anything that serves by contrast to call attention to another thing's good qualities
"pretty girls like plain friends as foils"
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a piece of thin and flexible sheet metal
"the photographic film was wrapped in foil"
Verb
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cover or back with foil
"foil mirrors"
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hinder or prevent (the efforts, plans, or desires) of
"What ultimately frustrated every challenger was Ruth's amazing September surge"
"foil your opponent"
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enhance by contrast
"In this picture, the figures are foiled against the background"