WHAT IS THE WORD?

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Across
  1. 4. The number or expression inside the radical sign.
  2. 6. A number that is the cube of an integer.
  3. 8. A symbol (√) used to denote the root of a number.
  4. 9. Exponents expressed as fractions, representing roots.
Down
  1. 1. A number that, when multiplied by itself, equals the original number.
  2. 2. A number that is the square of an integer.
  3. 3. The small number outside the radical sign that indicates the root to be taken.
  4. 5. A number that, when multiplied by itself three times, equals the original number.
  5. 7. An expression is in its simplest form when it cannot be reduced or simplified further.