vertex

noun

ver·​tex ˈvər-ˌteks How to pronounce vertex (audio)
plural vertices ˈvər-tə-ˌsēz How to pronounce vertex (audio) also vertexes
1
: the top of the head
2
a
: the point opposite to and farthest from the base in a figure
b
: a point (as of an angle, polygon, polyhedron, graph, or network) that terminates a line or curve or comprises the intersection of two or more lines or curves
c
: a point where an axis of an ellipse, parabola, or hyperbola intersects the curve itself
3
: a principal or highest point : summit
the vertex of the hill

Examples of vertex in a Sentence

Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
And the rule is vertices of the same color are not joined by an edge. Quanta Magazine, 26 June 2025 The crystal bases allowed complex, seemingly impossible calculations to be replaced with much simpler graphs of vertices connected by lines. Kenneth Chang, New York Times, 26 Mar. 2025 Simply look for the maximum number of lines (or edges) connected to a single point (or vertex), and add 1. Steve Nadis, Quanta Magazine, 12 May 2025 At the bottom vertex, the slope abruptly changes directions. Solomon Adams, WIRED, 23 Feb. 2025 See All Example Sentences for vertex

Word History

Etymology

Middle English, top of the head, from Latin vertic-, vertex, vortic-, vortex whirl, whirlpool, top of the head, summit, from vertere to turn

First Known Use

14th century, in the meaning defined at sense 1

Time Traveler
The first known use of vertex was in the 14th century

Browse Nearby Words

Cite this Entry

“Vertex.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/vertex. Accessed 14 Jul. 2025.

Kids Definition

vertex

noun
ver·​tex ˈvər-ˌteks How to pronounce vertex (audio)
plural vertices ˈvərt-ə-ˌsēz How to pronounce vertex (audio) also vertexes
1
: the point of a figure that is opposite to and farthest from its base
the vertex of a triangle
2
: the point where the two sides of an angle meet or where three or more edges of a polyhedron (as a cube) meet

Medical Definition

vertex

noun
ver·​tex ˈvər-ˌteks How to pronounce vertex (audio)
plural vertices ˈvərt-ə-ˌsēz How to pronounce vertex (audio) also vertexes
1
: the top of the head
2
: the highest point of the skull

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