## square root

square root the number or quantity which when squared will produce a given number or quantity: 3 is the

*square root*of 9## square root

noun

A divisor of a quantity that when squared gives the quantity. For example, the square roots of 25 are 5 and −5 because 5 × 5 = 25 and (−5) × (−5) = 25.

## square-root

Noun

(*plural* square roots)

- (mathematics) Of a number, another number which, when squared, yields the original number; sometimes constrained to be the positive number when two solutions exist.
*Every complex number has two square roots; for example, the square roots of âˆ’4 are 2i and âˆ’2i.*

Usage notes

Even in mathematical contexts, *square root* generally means *positive square root.* If there is a chance of ambiguity, prefer constructions like *a square root* or *a complex square root* to indicate the strict definition, or *the positive square root* or similar to indicate the looser sense.

Noun

- attributive form of
*square root*