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vertex, n.
  1. (of a polygon) hornpunktur, oddpunktur
  2. (of a cone or pyramid) topppunktur, broddur, tindur, toppur
    = apex
  3. (of a conic section) hvirfilpunktur
    -> secondary vertex, vertex 5
  4. (of a graph) hnútur, punktur
    = node 3
  5. (of a plane curve) hvirfilpunktur
    -> four-vertex theorem, vertex 3
  6. (of a ray) upphafspunktur
    -> initial point
  7. (of an angle) oddpunktur, topppunktur, broddur
  8. (of an isosceles triangle) topppunktur