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What’s the plural of “vertex”?

*Vertex* is singular. The plural of *vertex* is *vertexes* or *vertices*.

### Is vertex singular or plural?

*Vertex* is singular. The plural of *vertex* is *vertexes* or *vertices*.

### What’s a *vertex*? What’s the dictionary definition of *vertex*?

The word and noun *vertex* is defined as either “the top of the head”, or “the point opposite to and farthest from the base in a figure.”

### Nouns that end in -ex and -xes/-ces

Irregular nouns that end in *-ex* often convert to –*ces*/*-xes* as a plural. This is a characteristic of Latin words.

singular | plural |

index | indexes and indices |

matrix | matrices and matrixes |

appendix | appendices or appendexes |

codex | codices or codexes |

vortex | vortices or vortexes |

vertex | vertices or vertexes |

apex | apices or apexes |

### Examples of “vertex” used in context

Initially, every

vertexhas the same probability of being open to the flow of water.

The

vertexof the hill.

My cousin built his house on the

vertexof the highest hill in the county.

Last week, one of the students located the

vertexof a parabola in a particularly elegant way.

For each bit of information, we draw a

vertex(or node), called a digit node.

### Examples of “vertexes”/”vertices” in sentences

Using the ruler draw lines connecting the adjacent

verticesof the hexagon.

This solid has 4 faces, 4

verticesand 6 edges.

It consequently has four

verticesand six edges.

It has 12 pentagonal faces, and 30 edges, which intersect in fives to form 12

vertices.

Two polyhedra are reciprocal when the faces and

verticesof one correspond to theverticesand faces of the other.

### Synonyms of vertex

- pinnacle
- top
- crest
- zenith
- summit
- height
- tip
- apex
- Peak

### Origin of the word vertex

From etymonline on *vertex*:

1560s, “the point opposite the base in geometry,” from Latin

vertex“highest point,” literally “the turning point”.

*What’s the difference between they’re, their, and there?*

### Sources

- Definition of vertex.
- Synonyms for vertex.
- Origin of the word vertex.