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Plural of Appendix

plural of appendix

In the case of a book or document, the correct plural of appendix is “appendices” or “appendixes.” These terms are often used interchangeably and can be found at the end of a publication, containing supplementary material such as bibliographies or glossaries.

The Singular and Plural of “Appendix”

The singular form of the word is “appendix.” When it comes to pluralization, “appendix” has two accepted plural forms: “appendices” and “appendixes.” The choice between these forms depends on the context in which the word is used.

  • Appendices: This is the traditional plural form, derived from Latin. It is predominantly used in academic and professional contexts, especially when referring to books, reports, or documents.
  • Appendixes: This form is considered more modern and is commonly used in American English. It is often applied in medical contexts or in general usage.

Understanding Appendix

Definition of “Appendix”:

As a body part, the appendix is a tube-shaped sac attached to an opening into the lower end of the large intestine in humans and some other mammals. Its function is not entirely understood, but it's believed to be part of the immune system.

Usage of “Appendix”:

In medical discussions, “appendix” refers to the organ within the digestive system.

In academic or literary contexts, “appendix” refers to supplementary material.

Use of “Appendix” in Sentences

  1. Academic Context: “For further details on the research methodology, refer to Appendix A at the end of this document.”
  2. Medical Context: “The patient was diagnosed with appendicitis, an inflammation of the appendix, requiring immediate surgery.”
  3. Literary Context: “The author included an appendix in her novel to describe the historical background of her fictional world.”
  4. General Usage: “The teacher asked the students to submit their projects with an appendix containing all the references.
  5. Informative Context: “You can find a comprehensive list of sources in the appendices following the conclusion of this report.

Common Mistakes and Confusions

  • Appendices vs. Appendixes: The confusion between these two plural forms often leads to inconsistency in usage. Remember, “appendices” is preferred in academic and professional writings, while “appendixes” is more common in medical and general contexts.
  • Usage Depending on Context: Misidentifying the context (medical, academic, etc.) can lead to the incorrect plural form being used. Context is key in choosing the correct pluralization.

Commonly Asked Questions

  1. Is “appendices” only used in academic writing?
    • While “appendices” is predominantly used in academic and professional contexts, it is not exclusively so. The choice depends more on tradition and the preference of the field rather than a strict rule.
  2. Can “appendixes” be used when referring to the book supplements?
    • Yes, “appendixes” can be used for book supplements, especially in contexts where a more modern or American English usage is preferred.
  3. How do I decide which plural form to use?
    • The decision should be based on the context of your writing and the conventions of the field you are writing for. When in doubt, consult style guides or established literature in your field.


The word “appendix” and its plural forms, “appendices” and “appendixes,” serve important functions in various contexts, from medical to academic. Understanding the correct usage and pluralization of this term is crucial for effective communication. Whether referring to supplementary material in a document or a part of the human body, choosing the right plural form can enhance the clarity and professionalism of your writing. Remember, the choice between “appendices” and “appendixes” largely depends on the context and the conventions of the specific field you are addressing.


What is the plural of appendix?

The plural of appendix can vary depending on the context. In the case of a book or document, the correct plural forms are appendices or appendixes. When referring to the anatomical organ, the plural form is appendixes.

What is the difference between appendices and appendixes?

The noun appendix has its roots in Latin. In the sense of the organ, the term appendixes is the only correct plural form. The appendices in a book or document are typically found at the end and often contain supplementary material, such as bibliographies or glossaries.

Is it appropriate to use appendices in scholarly writing?

Yes, the plural form appendices is commonly used in scholarly writing. However, the term appendixes is also acceptable in this context.

What is the etymology of the word “appendix”?

The word appendix has its roots in Latin. It comes from the Latin word “appendere,” which means “to add on.”

What does the term appendix refer to in the anatomical sense?

In the anatomical sense, the term appendix refers to a small, tubular organ attached to the cecum of the large intestine.

Can appendixes also refer to additional parts or materials?

Yes, appendixes can also be used as a general term for any additional or supplementary parts or materials.

Is addendum a synonym for appendix?

Yes, the term addendum is a synonym for appendix and is often used interchangeably.

Jessica Smith

Jessica Smith

Jessica Smith, writer at, blends creativity with insight, exploring technology, culture, and psychology. With a background in English Literature, she crafts engaging stories inspired by nature and urban life. Outside writing, she enjoys exploring and continuous learning.View Author posts

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