radical sign

noun Mathematics.

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

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Origin of radical sign

First recorded in 1660–70

Words nearby radical sign

radicalize, radical left, radically, radical mastectomy, radical right, radical sign, radicand, radicant, radicchio, radicel, radices
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

British Dictionary definitions for radical sign

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 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012