1. The crown or top of the head; the top of a hill or other thing; the point of a cone, pyramid, angle, or figure; the zenith or point of the heavens perpendicularly over the head. Vertex of a curve, the extremity of the axis or diameter, or the point where the diameter meets the curve.

Nuttall's Standard dictionary of the English language By Nuttall, P.Austin

• vertues,
• vortext,
• votex,
• verten,
• vertix,
• vertic,
• verts,
• veretx,
• vertux,
• verte,
• verinx,
• kertes,
• lerte,
• verrel,
• vegte,
• Venex,
• vermex,
• vertia,
• verlee,
• evruex

• vortex.

The adjective form of the word "vertex" is "vertexal".