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French word gâteau comes from Middle High German wastel, Proto-Indo-European *wes-, Proto-Germanic *wistiliz
wastel (Middle High German)
*wes- (Proto-Indo-European)
*wistiliz (Proto-Germanic)
wastellus (Latin)
*wastilaz (Proto-Germanic)
*wastil (Frankish)
gâteau (French)
A sponge cake, i.e. a cake made with a chemical leavening agent (e.g. baking powder), making it light and airy (as opposed to a denser torte).
gastel (Old French)
(heraldry) roundel, bezant, gastell. Round cake, loaf of bread, wastel.
gasteau (Middle French)
gastel (Middle French)