Vertex

n.	1.	A turning point; the principal or highest point; top; summit; crown; apex.
	2.	(Anat.) The top, or crown, of the head.
	3.	(Astron.) The zenith, or the point of the heavens directly overhead.
	4.	(Math.) The point in any figure opposite to, and farthest from, the base; the terminating point of some particular line or lines in a figure or a curve; the top, or the point opposite the base. Vertex of a curve (Math.) the point in which the axis of the curve intersects it. Vertex of an angle (Math.) the point in which the sides of the angle meet. Vertex of a solid (Math.) the point in which the axis pierces the surface.

Noun	1.	vertex - the point of intersection of lines or the point opposite the base of a figure
	2.	vertex - the highest point (of something); "at the peak of the pyramid" Synonyms: apex, acme, peak

L, acme, angle, apex, apogee, bend, bifurcation, bight, brow, cant, cap, chevron, climax, cloud nine, coin, corner, crank, crest, crook, crotchet, crown, culmen, culmination, deflection, dogleg, edge, elbow, ell, extreme limit, extremity, fork, furcation, heaven, heavens, height, heights, high noon, highest pitch, highest point, hook, inflection, knee, limit, maximum, meridian, mountaintop, ne plus ultra, no place higher, nook, noon, peak, pinnacle, pitch, point, pole, quoin, ridge, roof, seventh heaven, sky, spire, summit, swerve, tip, tip-top, top, upmost, upper extremity, uppermost, utmost, veer, very top, zag, zenith, zig, zigzag