square root

square root
a quantity of which a given quantity is the square: The quantities +6 and -6 are square roots of 36 since (+6)×(+6)=36 and (-6)×(-6)=36.
[1550-60]

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      in mathematics, a factor of a number that, when multiplied by itself, gives the original number. For example, both 3 and –3 are square roots of 9. As early as the 2nd millennium BC, the Babylonians possessed effective methods for approximating square roots. See root.

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Universalium. 2010.

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