What’s the plural of “apex”?
The plural of apex is apexes or apices.
The climbers reached the apexes of the two peaks.
The book includes several useful indices at the back.
The geometric shape had several pointed vertex.
The researcher analyzed the different matrixs of the samples.
What’s the singular of apex?
The singular of apex is just apex.
What does the word apex/apexes mean?
The dictionary defines the word apex as “the highest or the greatest part of something, especially forming a point.”
Other irregular plural nouns
Apex belongs to the Latinate category of irregular plural nouns that end in -ex/ix. The -ex/-ix suffix is characteristic of Latin word origin. See the following chart of irregular Latinate plural noun forms that are similar to apex:
| 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 |
The plural of “apex,” associate it with “index” (indices/indexes); both have irregular Latinate plurals ending in -es or -ices.
Examples of the word apex used in sentences
He was at the apex of his career: he had climbed to the top of the heap.
At the apex of the party was its central committee.
Now, this is a root apex growing against a slope.
Leg and arm raised, he is shown at the apex of his celebration, seconds before his caddie leapt excitedly into his arms.
At the apex of our country sits the president of our nation.
Examples of apexes/apices used in application
They are most commonly found at the apices of the involved teeth.
The itching is intense, and in consequence their apices are excoriated.
Minute fragments of shoot apices are proverbially difficult to culture.
The primary site of Al toxicity locates in root apices .
This concept has now been replaced, for stem apices, by the tunica-corpus theory.
Origin of the word apex
From etymology online on apex (n.):
The tip, point, or summit” of anything, c. 1600, from Latin apex “summit, peak, tip, top, extreme end.”
Synonyms of apex
- top
- peak
- pinnacle
- summit
- crest
- vertex
What’s the difference between they’re, their, and there?
Work Sheet
What are the correct plural forms of “apex” according to the post?
According to the post, “apex” belongs to which category of nouns?
Which of the following sentences uses a correct plural form mentioned in the post’s usage notes or chart?
What is the singular form of “apex”?
Based on the definition provided in the post, what does “apex” mean?
The climbers reached the of the two peaks.
The word “index” has correct plural forms “indexes” and ““, similar to “apex”.
Minute fragments of shoot are proverbially difficult to culture.
Words like apex, index, and matrix belong to the category of irregular plural nouns ending in -ex/-ix.
The geometric shape had several pointed .
Frequently Asked Questions
What’s the plural of “apex”?
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Why does apex have irregular plurals?
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What does the word apex mean?
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Any words similar to apex in plural?
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Can I see apexes/apices in a sentence?
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Yash, D. "What’s the Plural of Apex?." Grammarflex, Jun 3, 2025, https://www.grammarflex.com/whats-the-plural-of-apex/.
Sources
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Synonyms for apex.
