corn syrup
US /kɔːrn ˈsɪr.əp/
UK /kɔːrn ˈsɪr.əp/

1.
a thick, sweet syrup made from cornstarch, used as a sweetener and thickener in foods
:
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Many processed foods contain high-fructose corn syrup.
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She added corn syrup to the candy mixture to prevent crystallization.