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Definition of vertex

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ver·tex  audio  (vűrtks) KEY  

NOUN:
pl. ver·ti·ces   (-t-sz) KEY   also ver·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.
ETYMOLOGY:
Latin, whirlpool, crown of the head (where the hair forms a whorl), vertex, from vertere, to turn; see wer- 2 in Indo-European roots


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The American Heritage® Dictionary of the English Language, Fourth Edition.
Copyright © 2000 by Houghton Mifflin Company.
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