appendix

noun

ap·​pen·​dix ə-ˈpen-diks 

plural appendixes or appendices ə-ˈpen-də-ˌsēz 

1

a

: appendage

b

: supplementary material usually attached at the end of a piece of writing

The book's appendix includes a bibliography.

2

: a bodily outgrowth or process

specifically : vermiform appendix

Synonyms

• addendum
• afterword
• codicil
• excursus
• supplement

Examples of appendix in a Sentence

In your textbooks, turn to Appendix 3: Glossary of Terms.

The book has several appendixes.

Recent Examples on the Web

Inside Randall Emmett’s crumbling empire June 30, 2022 The movies mentioned only in passing, in an appendix, are also worth noting, but not for happy reasons. —Chris Vognar, Los Angeles Times, 11 June 2024

During the Brexit talks, the United Kingdom and the EU agreed on the latter option in what’s come to be called the Northern Ireland Protocol, an appendix to the larger withdrawal agreement. —Anand Menon, Foreign Affairs, 30 Dec. 2021

Numbers for its greenhouse gas emissions are buried in the report’s appendix without adding up the line items to show a total for its carbon footprint. —Justine Calma, The Verge, 24 May 2024

In November 2019, Ms. McDermott’s appendix ruptured, causing an infection, and she was hospitalized for more than a month. —Alix Wall, New York Times, 17 May 2024

Word History

Etymology

Latin appendic-, appendix, from appendere — see append

First Known Use

1542, in the meaning defined at sense 1a

Phrases Containing appendix

• vermiform appendix

Kids Definition

appendix

noun

ap·​pen·​dix ə-ˈpen-diks 

plural appendixes or appendices -də-ˌsēz 

1

: additional material attached at the end of a piece of writing

2

: a small tube that is closed at one end and projects from the pouch marking the beginning of the large intestine in the lower right side of the abdomen

Medical Definition

appendix

noun

ap·​pen·​dix ə-ˈpen-diks 

plural appendixes or appendices -də-ˌsēz 

: a bodily outgrowth or process

specifically : vermiform appendix