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  1. radical sign

    • IPA[ˈradəkəl ˌsīn]
    • 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

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

    Oxford Dictionary