From Longman Dictionary of Contemporary Englishsquare rootˌsquare ˈroot noun [countable] HMthe square root of a number is the number which, when multiplied by itself, equals that numbersquare root of The square root of nine is three.

Examples from the Corpus

square root• A number of early computers had an instruction to extract a square root, but nowadays this operation is achieved by software.• Does this have a square root?• Having a square root for-1, it is now no great effort to provide square roots for all the real numbers.• Excluding the few outliers, we can calculate the square root of the average squared error over all subjects for each repetition.• Unfortunately, the question seemed to me something of a nonsense, as it involved the square root of a minus quantity.• The square root of it is two hundred and seventy-seven point four nine.