vertex,
n. 1a. any point of intersection of two sides of a polygon or plane surfaces of a solid, especially that opposite the base in a given orientation.
b. an extreme point of a polyhedron. 2. the point of intersection of a pencil of lines. 3. (of an ellipse) either of the points at which the major axis intersects the curve. 4. (in graph theory) one of the nodes that, together with associated edges, constitutes a graph.
b. an extreme point of a polyhedron. 2. the point of intersection of a pencil of lines. 3. (of an ellipse) either of the points at which the major axis intersects the curve. 4. (in graph theory) one of the nodes that, together with associated edges, constitutes a graph.