Definition of: vertex

(vûr′teks) noun plural ·tex·es or ·ti·ces (-tə·sēz)
1. The highest point or summit of anything; apex; top.
2. Astron. a The zenith, b The point in the sky toward or from which a group of stars appears to be moving.
3. The top of the head; also, in craniometry, the top of the arch of the skull.
4. Math. a The point of intersection of the sides of an angle. b The point opposite to, and farthest from, the base. c The intersection of three or more edges of a polyhedron. [<L, the top <vertere turn]