square root
noun
- inverse operation of square for finding the original base number
Wiktionary
noun
- The number which, when squared, yields another number.
“Near-synonym: √”
“The square roots of 4 are 2 and −2, the square root of 0 is 0, and the square roots of −4 are 2i and −2i.”
- The positive number which, when squared, yields another number: the principal square root.
“The square root of 4 is 2. No negative real square roots exist. Negative numbers have no real square roots.”