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index, n.
  1. vísir, vísitala
  2. (of a fixed point) vísitala
  3. (of a matrix) vísitala
  4. (of a point with respect to a curve) vafningstala
    = winding number
  5. (of a root) rótarvísir
  6. (of a subgroup) vísitala
  7. (of a vector field) vísitala
  8. (of an elliptic operator) vísitala