3. (Science: mathematics) 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, the point in which the axis pierces the surface.
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.
Origin: L. Vertex, -icis, a whirl, top of the head, top, summit, from vertere to turn. See Verse, and cf. Vortex.
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... represent chemical structures. You’ve got a distorted Haworth projection of the cyclic or pyranose form of glucose. There are carbon atoms at each vertex of the hexagon (except the one occupied by an oxygen atom). If you count the vertices as one carbon each and add to that count the explicit carbon ...
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