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See also: Appendix
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Intestinal tract, with the vermiform appendix highlighted.


Borrowing from Latin appendix.



appendix (plural appendices or appendixes)

  1. (obsolete in general sense) Something attached to something else; an attachment or accompaniment.
    • 1621, Democritus Junior [pseudonym; Robert Burton], The Anatomy of Melancholy, Oxford: Printed by Iohn Lichfield and Iames Short, for Henry Cripps, OCLC 216894069:, vol.I, New York 2001, p.244:
      idleness is an appendix to nobility; they count it a disgrace to work, and spend all their days in sports, recreations, and pastimes […].
  2. Specifically, a text added to the end of a book or an article, containing information that is important to but is not the main idea of the main text.
  3. (anatomy) The vermiform appendix, an inner organ that can become inflamed.

Usage notes[edit]

The correct plural of appendix depends on the context. When referring to the text at the end of a book or article, the plural is usually stated as appendices, although often as appendixes. Either is correct in standard usage. In the sense of the organ, appendixes is the only plural. Compare vacuum, which can pluralize to vacua or vacuums depending on the meaning.

Derived terms[edit]


The translations below need to be checked and inserted above into the appropriate translation tables, removing any numbers. Numbers do not necessarily match those in definitions. See instructions at Wiktionary:Entry layout#Translations.



From appendō (hang upon).



appendix f (genitive appendicis); third declension

  1. supplement, addition
  2. appendage
  3. barberry (shrub)


Third declension.

Case Singular Plural
nominative appendix appendicēs
genitive appendicis appendicum
dative appendicī appendicibus
accusative appendicem appendicēs
ablative appendice appendicibus
vocative appendix appendicēs

Related terms[edit]