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
Sorry, no etymologies found.