radical sign
noun Mathematics.
the symbol √ or 
indicating extraction of a root of the quantity that follows it, as √25=5 or 
.
indicating extraction of a root of the quantity that follows it, as √25=5 or .RELATED CONTENT
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Origin of radical sign
First recorded in 1660–70
Dictionary.com Unabridged
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
radical sign
noun
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√
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
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