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Synonyms
ver·tex (vûŕtĕkś)

[Latin, whirlpool, crown of the head (where the hair forms a whorl), vertex, from vertere, to turn.]

noun: pl., -ti·ces (-tĭ-sēź), also -tex·es 

  1. The highest point; the apex or summit: the vertex of a mountain.
  2. Anatomy
    1. The highest point of the skull.
    2. The top of the head.
  3. Astronomy The highest point reached in the apparent motion of a celestial body.
  4. Mathematics
    1. The point at which the sides of an angle intersect.
    2. The point on a triangle or pyramid opposite to and farthest away from its base.
    3. A point on a polyhedron common to three or more sides.