nouns
a piece of thin and flexible sheet metal
"the photographic film was wrapped in foil"
is a type of (narrower)
sheet of metal formed into a thin plate
anything that serves by contrast to call attention to another thing's good qualities
"pretty girls like plain friends as foils"
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"
picture consisting of a positive photograph or drawing on a transparent base; viewed with a projector
a light slender flexible sword tipped by a button
domain category
the art or sport of fighting with swords (especially the use of foils or epees or sabres to score points under a set of rules)
is a type of (narrower)
a sword used in the sport of fencing