vertex

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ver·tex / ˈvərˌteks/ • n. (pl. -ti·ces / -təˌsēz/ or -tex·es ) 1. the highest point; the top or apex. ∎ Anat. the crown of the head. 2. Geom. each angular point of a polygon, polyhedron, or other figure. ∎  a meeting point of two lines that form an angle. ∎  the point at which an axis meets a curve or surface.

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