from The American Heritage® Dictionary of the English Language, 4th Edition
- n. The quantity under a radical sign. For example, 3 is the radicand of √3.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. The number or expression whose square root or other root is being considered; e.g. The 3 in
from The Century Dictionary and Cyclopedia
- n. In mathematics, an expression of which a root is to be extracted.
Latin rādīcandum, neuter gerundive of rādīcāre, to take root, from rādīx, rādīc-, root; see radical.(American Heritage® Dictionary of the English Language, Fourth Edition)
Multiplying [√ (-2) • √ (-2)] = -2, since a square root multiplied by itself just gives the radicand - that is, the number under the radical symbol.