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radical sign

noun

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


radical sign

noun

  1. 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


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Word History and Origins

Origin of radical sign1

First recorded in 1660–70
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Example Sentences

The radical sign (√) was derived from the initial letter of the word radix.

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