from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. Mathematics The sign √ placed before a quantity, indicating extraction of the root designated by a raised integer. When extracting a square root, the raised integer is customarily omitted.
  • n. Mathematics The radical sign together with a horizontal bar extending from its top to the end of the expression from which a root is to be extracted.

from the GNU version of the Collaborative International Dictionary of English

  • adj. the sign √ (originally the letter r, the initial of radix, root), placed before any quantity, denoting that its root is to be extracted; thus, √a, or √(a + b). To indicate any other than the square root, a corresponding figure is placed over the sign; thus, ∛a, indicates the third or cube root of a.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. a sign indicating the extraction of a root


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