vertex

 
Pronunciation: /ˈvəːtɛks/

noun (plural vertices /-tɪsiːz/ or vertexes)

  • 1the highest point; the top or apex.
  • Anatomy the crown of the head.
  • 2 Geometry each angular point of a polygon, polyhedron, or other figure.
  • a meeting point of two lines that form an angle.
  • the point at which an axis meets a curve or surface.

Origin:

late Middle English: from Latin, 'whirlpool, crown of a head, vertex', from vertere 'to turn'

Spelling help

The plural of vertex can be spelled either vertices (as in the original Latin) or vertexes.