radical sign

radical sign

noun Mathematics.
the symbol √ or indicating extraction of a root of the quantity that follows it, as √25=5 or .

Origin:
1660–70

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World English Dictionary
radical sign
 
n
the symbol √ placed before a number or quantity to indicate the extraction of a root, esp a square root. The value of a higher root is indicated by a raised digit in front of the symbol, as in ³√

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