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Definition of appendix

appendix

/əˈpɛn.dɪks/
ap · pen · dix

Plural:appendices
•
Adjective:appendicular
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appendix Lexical Profile

appendix Game Scores & Validity

• noun

1

A small, narrow, tube-shaped pouch of tissue attached to the cecum at the beginning of the large intestine in humans and certain other mammals.

Example

"She was rushed to the hospital for emergency surgery after the doctor diagnosed her with a ruptured appendix."


2

A section of supplementary material placed at the end of a book, report, or formal document, typically containing detailed tables, reference data, or explanatory notes.

Example

"The raw survey results and statistical tables can be found in the appendix at the back of the report."

Synonyms
View all synonyms for appendix

Word Nuance & Usage

Both "appendices" and "appendixes" are accepted plural forms, though "appendices" is generally preferred for the supplementary section of a book or academic document, while "appendixes" is more commonly used in medical contexts for the anatomical organ.

• Rhymes for appendix

Word Origin & Etymology

Borrowed in the mid-16th century directly from Latin appendix, meaning "an addition" or "something that hangs on," derived from appendere ("to cause to hang from"), a compound of ad- ("to") and pendere ("to hang").

Cite this Entry


Wordmom. (2026). Definition of Appendix. In Wordmom Dictionary. Retrieved Nov 5, 2026, from https://wordmom.com/dictionary/appendix
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