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1. Oxford Dictionary

   radical sign

   • n.
     the sign √ which indicates the square root of the number following (or a higher root indicated by a preceding superscript numeral).

   • noun: radical sign, plural noun: radical signs

2. • 更多解釋

   radical sign

   • IPA[ˈradəkəl ˌsīn]

   • n.
     the sign √ which indicates the square root of the number following (or a higher root indicated ...

   Oxford American Dictionary