# Definition of vertex in US English:

## vertex

### noun

• 1The highest point; the top or apex.

• ‘But what vertices of anxiety lie behind the gentle opposition of town and country, youth and age when Janice arrives in Dulwich.’
• ‘Balancing on the vertex requires enormous training in concentration.’
• ‘Now in a single move a coin must slide between adjacent vertices.’
• ‘The game begins at one particular vertex, corresponding to the starting position of the game.’
apex, peak, tip, top, mountaintop, summit, pinnacle, crest, brow, crown, height, highest point
View synonyms
1. 1.1Anatomy The crown of the head.
• ‘As the head clears the pubic symphysis, the vertex is pulled upward at an angle of 45 degrees to the floor.’
• ‘This will protect the perineum and assist in extension of the head as the vertex passes the symphysis.’
• ‘She has been left with extensive scars and areas of alopecia on the vertex, occipital, and right parietal regions of her head.’
• ‘This is followed by thinning over the vertex and then, eventually, complete loss of hair over the crown.’
• ‘The Sahasrara or crown chakra is related to the pituitary gland and externalizes at the vertex of the scalp.’
• 2Geometry
Each angular point of a polygon, polyhedron, or other figure.

• ‘The frequency of each morph increases from the one side of the triangle to the opposite vertex.’
• ‘The vertices were then connected to their neighbours to create the polygons.’
• ‘He also found another solution where the three bodies were at the vertices of an equilateral triangle.’
• ‘Einstein observes that the Menelaus theorem is symmetric with respect to the vertices of the triangle.’
• ‘Now add parallels beyond those in the same direction, through the vertices of the largest triangle.’
1. 2.1 A meeting point of two lines that form an angle.
• ‘In wild-type flies, the head vertex is symmetrical and composed of three distinct domains.’
• ‘Bond angles are calculated using the central atom as the vertex of the bond angle.’
• ‘An undirected edge connecting these two vertices indicates this relationship.’
• ‘The vertex representing k is the final state of the kth chain.’
• ‘Two adjacent vertices must be of the same colour.’
2. 2.2 The point at which an axis meets a curve or surface.
• ‘Think of the two islands and the mainland as vertices with the paths between these nodes called arcs.’
• ‘A graph is a mathematical structure consisting of vertices connected by edges.’
• ‘A coin may only be placed by dragging the cursor along an edge from one vertex to another.’
• ‘Each vertex unit can have one vector and one scalar operation in flight simultaneously.’
• ‘The three 6-cycles pairwise intersect in two non-adjacent vertices.’

### Origin

Late Middle English: from Latin, ‘whirlpool, crown of a head, vertex’, from vertere ‘to turn’.

## vertex

/ˈvərˌteks//ˈvərˌtɛks/