[ uh-pen-diks ]
See synonyms for: appendixappendices on

noun,plural ap·pen·di·ces [uh-pen-duh-seez], /əˈpɛn dəˌsiz/, ap·pen·dix·es.
  1. supplementary material at the end of a book, article, document, or other text, usually of an explanatory, statistical, or bibliographic nature.

  1. Anatomy.

  2. Aeronautics. the short tube at the bottom of a balloon bag, by which the intake and release of buoyant gas is controlled.

Origin of appendix

First recorded in 1535–45; from Latin: literally, “appendage,” equivalent to append(ere) “to add on” + -ix (equivalent to -ic- noun suffix + -s nominative singular ending); see origin at append

synonym study For appendix

Appendix, supplement both mean material added at the end of a book. An appendix gives useful additional information, but even without it the rest of the book is complete: In the appendix are forty detailed charts. A supplement, bound in the book or published separately, is given for comparison, as an enhancement, to provide corrections, to present later information, and the like: A yearly supplement is issued.

usage note For appendix

Appendices, a plural borrowed directly from Latin, is the usual plural, especially in scholarly writing, when referring to supplementary material at the end of a book. Appendixes is the usual plural in the anatomical meaning.

Other words for appendix

Words that may be confused with appendix

Words Nearby appendix Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

How to use appendix in a sentence

British Dictionary definitions for appendix


/ (əˈpɛndɪks) /

nounplural -dices (-dɪˌsiːz) or -dixes
  1. a body of separate additional material at the end of a book, magazine, etc, esp one that is documentary or explanatory

  2. any part that is dependent or supplementary in nature or function; appendage

  1. anatomy See vermiform appendix

Origin of appendix

C16: from Latin: an appendage, from appendere to append

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Scientific definitions for appendix


[ ə-pĕndĭks ]

Plural appendixes appendices (ə-pĕn-dĭ-sēz′)
  1. A tubular projection attached to the cecum of the large intestine and located on the lower right side of the abdomen. Also called vermiform appendix

The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

Cultural definitions for appendix


A small saclike organ located at the upper end of the large intestine. The appendix has no known function in present-day humans, but it may have played a role in the digestive system in humans of earlier times. The appendix is also called the vermiform appendix because of its wormlike (“vermiform”) shape.

The New Dictionary of Cultural Literacy, Third Edition Copyright © 2005 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.