(?), n.;
pl. E. Vertexes (#), L. Vertices (#).
[L. vertex, -icis, a whirl, top of the head, top, summit, from vertere to turn. See Verse, and cf. Vortex.] A turning point; the principal or highest point; top; summit; crown; apex. Specifically: --
[1913 Webster]

(a) (Anat.) The top, or crown, of the head.
[1913 Webster]

(b) (Astron.) The zenith, or the point of the heavens directly overhead.
[1913 Webster]

(c) (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.
[1913 Webster]

The principal vertex of a conic section is, in the parabola, the vertex of the axis of the curve: in the ellipse, either extremity of either axis, but usually the left-hand vertex of the transverse axis; in the hyperbola, either vertex, but usually the right-hand vertex of the transverse axis.
[1913 Webster]

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, or Vertex of a surface of revolution (Math.), the point in which the axis pierces the surface.
[1913 Webster]


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Sun 19th September 2021