n. (pl. vertices or vertexes) 1 the highest point; the top or apex. 2 Geom. a each angular point of a polygon, polyhedron, etc. b a meeting-point of two lines that form an angle. c the point at which an axis meets a curve or surface. 3 Anat. the crown of the head.
[ L vertex -ticis whirlpool, crown of a head, vertex, f. vertere turn ]