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

The surgery to remove an appendix gets complicated by nurse Linzley (Sarah Sherman), who first fills out a form incorrectly, meaning the patient’s gallbladder is removed instead. —William Vaillancourt, Rolling Stone, 15 Dec. 2024

In the sketch, Chris Rock plays a surgeon surrounded by medical staff as surgery to remove an appendix is underway. —Rosy Cordero, Deadline, 14 Dec. 2024

That’s a metric that is derived by comparing the team’s points scored and allowed to the opponents’ average points scored and allowed, per an appendix in the tie-breaking rules. —Seth Emerson, The Athletic, 21 Aug. 2024

An English translation of the book, by American poet Emmett Williams and featuring illustrations by French cartoonist Roland Topor, came out in 1966, and Spoerri and others added appendices and expanded the index. —News Desk, Artforum, 27 Nov. 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