vertex
n. countablen. the highest point of something, or a corner where two or more lines meet.
n. the highest point or apex of a structure; in geometry, the point where two or more curves, lines, or edges meet.
The vertex of the triangle is at the top of the page.
In computer graphics, each vertex of a 3D model must be precisely calculated to render the shape correctly.
The surgeon carefully identified the vertex of the skull before beginning the procedure to ensure the incision was placed at the highest anatomical point.
Late Middle English, borrowed from Latin vertex (“whirl, eddy; top, crown, peak, summit”). Doublet of vortex.
The plural form is usually 'vertices' in mathematical and technical contexts, though 'vertexes' is occasionally used in general English.
the vertexes of the cubethe vertices of the cubeIn technical, mathematical, and scientific writing, the Latin plural 'vertices' is preferred over the standard English 'vertexes'.