WordReference Random House Unabridged Dictionary of American English © 2020
barley sug′ar, 
  • Fooda brittle, amber-colored, transparent candy, formerly boiled in a decoction of barley, consisting of sugar, cream of tartar, and orange or lemon juice, usually twisted into strips or molded into a variety of shapes. Also called  barley can′dy. 
    • 1705–15

    Collins Concise English Dictionary © HarperCollins Publishers::
    barley sugar n
    1. a brittle clear amber-coloured sweet made by boiling sugar, originally with a barley extract
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