Definition of Vertex

The highest point of something. | (anatomy) The highest surface on the skull. | (geometry) The common point of the two rays of the angle, or its equivalent structure in polyhedra (meeting of edges) and higher order polytopes.

- Given the tangent at the
**vertex**of a parabola, and two other tangents, to find the focus. - Frontal vesicle: in Odonata; that elevated area on the
**vertex**upon which the ocelli are situated. - The bones of the skull are cut through and the whole of the vault removed, exposing the entire
**vertex**of the brain. - Lateral foveolae: in Orthoptera: foveate depressions on the margins of the
**vertex**near the front border of the eye. - Epicranium: the upper part of the head from the front to the neck: often used to include front,
**vertex**and genae:= calva. - Pursuing the decline and curve of the street a little further brings you to the
**vertex**of a triangle of level ground, on the base of which the chapel stands. - In a parabola the
**vertex**is equally distant from the focus and the directrix, these three points and the point at infinity on the axis being four harmonic points. - By taking the point at the
**vertex**of the conic, we note that this ratio is less than unity for the ellipse, greater than unity for the hyperbola, and equal to unity for the parabola.

- The distance from the
**vertex**to the tragus is uniformly great. - Sinciput: in Coleoptera; that part of the
**vertex**between the eyes.