the symbol √ or indicating extraction of a root of the quantity that follows it, as √25=5 or .
The 13th Zodiac Sign: OphiuchusWhether or not you believe that the sun, moon, stars, and planets have any bearing on your personality, you probably know what your astrological sign is. But have you heard of Ophiuchus? Some astrologers consider it to be the 13th astrological sign.
Origin of radical sign
First recorded in 1660–70
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
British Dictionary definitions for radical sign
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