appendix
noun
ap·pen·dix
ə-ˈpen-diks 
plural appendixes or appendices
ə-ˈpen-də-ˌsēz
1
a
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
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
Believed to be made from a sheep’s appendix, the prophylactic dates back to 1830 and is likely a souvenir from a brothel, according to a statement from the Rijksmuseum in Amsterdam on Tuesday.
—
Jack Guy, CNN Money, 3 June 2025
While the surgery was initially intended to address her appendix, doctors discovered a myriad of issues Irwin, 26, needed medical attention for, including 14 additional lesions related to her endometriosis diagnosis.
—Tracy Wright, FOXNews.com, 26 May 2025
He was taken to the hospital, and his appendix was removed.
—Dylan Loeb McClain, New York Times, 20 May 2025
Although cancer of the appendix is rare – typically, it’s estimated to affect about 1 or 2 people for every 1 million in the United States each year – diagnoses are rising sharply among Generation X and millennials, according to a new study.
—Jacqueline Howard, CNN Money, 15 June 2025
See All Example Sentences for appendix
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Jack Guy, CNN Money, 3 June 2025
While the surgery was initially intended to address her appendix, doctors discovered a myriad of issues Irwin, 26, needed medical attention for, including 14 additional lesions related to her endometriosis diagnosis.
—Tracy Wright, FOXNews.com, 26 May 2025
He was taken to the hospital, and his appendix was removed.
—Dylan Loeb McClain, New York Times, 20 May 2025
Although cancer of the appendix is rare – typically, it’s estimated to affect about 1 or 2 people for every 1 million in the United States each year – diagnoses are rising sharply among Generation X and millennials, according to a new study.
—Jacqueline Howard, CNN Money, 15 June 2025
See All Example Sentences for appendix
Cite this Entry
“Appendix.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/appendix. Accessed 21 Jul. 2025.
Copy CitationKids 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
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