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Longman Dictionary of Contemporary English
candy apple
noun
EXAMPLES FROM CORPUS
▪ Clarins makes three of the best new shades: as deeply hued as a candy apple is Russet, a gorgeous yellow-red.
Wiktionary
candy apple

n. (context US English) apple covered in a hard sugar candy coating.

WordNet
candy apple

n. an apple that is covered with a candy-like substance (usually caramelized sugar) [syn: candied apple, taffy apple, caramel apple, toffee apple]

Wikipedia
Candy apple

Candy apples, also known as toffee apples outside of North America, are whole apples covered in a hard toffee or sugar candy coating, with a stick inserted as a handle. These are a common treat at autumn festivals in Western culture in the Northern Hemisphere, such as Halloween and Guy Fawkes Night because these festivals fall in the wake of the annual apple harvest. Although candy apples and caramel apples may seem similar, they are made using distinctly different processes.