Dictionary-enhanced plural guide
What is the Plural of “Abacus”?
Learn the singular and plural noun forms, the rule behind the plural, and examples that show the form in context.
Singular and Plural Form of Abacus
Abacus is the singular noun form. Abacuses is the plural form.
Dictionary meaning: Tool with sliding beads you push to solve math problems step by step.
Why is the Plural of Abacus “abacuses”?
The Irregular Plural Rule for Abacus
Words ending in s, x, z, ch, or sh add -es to form the plural. Example: abacus → abacuses
Plural pattern: irregular.
How to Remember the Plural of Abacus
“abacus” → “abacuses” is an irregular plural — there is no rule, so memorise the pair as a whole. Try writing it in 3 sentences today.
A common slip-up: Avoid /əˈbæk.əs/ (second syllable stressed)..
Singular vs Plural Examples with Abacus
See abacus and abacuses used in real sentences side by side.
- The child used an abacus to learn counting. A2
- Teachers use the abacus to teach basic arithmetic skills. B1
- The abacus represents an important milestone in the history of computational devices. B2
Common Plural Mistakes with Abacus
Wrong: The abacuses is very old.
Correct: The abacuses are very old.
Plural 'abacuses' requires 'are', not 'is'.
How to Pronounce Abacus and Abacuses
First syllable stressed: AB-uh-kus. The 'a' sounds like the 'a' in 'cat'.
Other Words With the Same Plural Pattern as Abacus
These nouns follow the same irregular rule. Click any word to see its plural page.
A young boy or girl who is not yet an adult.
the two parts at the bottom of your legs that touch the…
A tiny insect that lives around food and moves very fast.
One of two equal parts that make up something complete.
A grown-up male person. A man is an adult male, not a…
The ability to remember things from the past, or the thought you…
One human; a single individual.
Money that a person earns from their job, paid regularly by their…
Origin and Etymology of Abacus
Latin abacus, from Greek abax meaning 'board' or 'table for counting'.
Cultural note: Traditional tool still used in East Asia for mathematics education.
Frequently Asked Questions About the Plural of Abacus
What is the plural of “abacus”?
The plural of “abacus” is “abacuses”.
Is “abacuses” regular or irregular?
This page classifies it as irregular based on the available plural data.