/ ˈflæpdʒæk; NAmE / noun
1.
[ U , C ] ( BrE ) a thick soft biscuit made from oats , butter, sugar and syrup
2.
[ C ] ( NAmE ) a thick pancake
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WORD ORIGIN
early 17th cent. (in sense 2): from flap (in the dialect sense toss a pancake ) + jack ; sense 1 dates from the 1930s and is probably a regional coinage.