appendix

/əˈpɛn.dɪks/

//əˈpɛn.dɪks// noun

By · According to Wiktionary data (CC BY-SA) ·

"appendix" is a 8-letter English headword indexed on PlainSpell.

The verdict

“appendix” has 10 generated spelling variants in the English index at frequency #14,692. The variants make it a useful spelling check.

#14,692
frequency rank, English
3,931
“A” headwords
10
tracked misspellings
1
confusable pair

According to Wiktionary data (CC BY-SA, analyzed September 3, 2026) - Something attached to something else; an attachment or accompaniment.

Corpus desk

Index EN-appendix · appendix · English

appendix · rank #14,692 · 10 variants · 1 confusable

  • FREQ-MID #14,692
  • LEN-LONG 8 letters
  • VOW-3 3 vowels
  • CONFUS-LOW 1 pairs
  • VAR-MID 10 variants
  • BOOK-MID 3,931
  • PHOTO-FINISH anterior

Nearest frequency peer: anterior (-1 rank slots)

Read with this headword: Spelling guide for this pattern

Desk codes from Wiktionary headword shape, FrequencyWords rank tier, confusable-pair count, generated misspelling depth, letter-cohort book size, and photo-finish peer. Not a difficulty grade.

Rank peers near misspelling magnet “appendix”

Same rarity band: useful when a typo lands on a peer headword

corpus weight

What this shows “appendix” sits among these FrequencyWords peers; misspelling depth is tracked separately in the edit-distance chart.

Source FrequencyWords open word-frequency list As of September 3, 2026

Visual similarity to commonly confused words

How many letter changes separate each confused pair (Levenshtein distance, normalized).

appendix vs append
75% similar

Source: PlainSpell confusable corpus (Wiktionary, CC BY-SA).

Key facts for appendix
PropertyValue
Headwordappendix
LanguageEnglish
Part of speechNoun
IPA/əˈpɛn.dɪks/
Letters8
Frequency rank#14,692
Misspellings tracked10
Confusable pairs1
SourceWiktionary (kaikki.org)

Frequency seat of misspelling magnet “appendix”

Word frequency stretches from the small set of words we reach for constantly (left) out to the long tail barely used once in a while (right).appendixlands here:

#1#100#1K#10K#100K
← used constantlyrarely used →

Ticks step logarithmically, so each one marks a roughly tenfold drop in how often the word turns up. Same rarity band neighbours include “anterior” (#14,691), “approx” (#14,693), “angular” (#14,690). Among 3,931 “A” headwords, “appendix” is #14,692. Source: FrequencyWords open word-frequency list.

A misspelling magnet

The generator records 10 spelling variants around appendix (IPA /əˈpɛn.dɪks/), anoun. Corpus frequency is #14,692 among 3,931 “A” headwords. Wiktionary lists 4 senses, so context still picks the gloss.

Our generated misspelling index lists 10 likely wrong-spelling variants for appendix, with forms such as "apendix", "apepndix", and "appednix". Every one of these variants traces to a single-character edit -- an added or dropped letter, a swapped consonant, or a vowel swap -- the kind of slip a spell-checker is built to catch. It also participates in 1 confusable-pair relationship, "append", where similar look or sound leads writers to substitute one word for another in context.

Etymologically, the entry records: Borrowed from Latin appendix. The correct English form is appendix, spelled A-P-P-E-N-D-I-X.

Definition

  1. 1
    Something attached to something else; an attachment or accompaniment.
  2. 2
    A text added to the end of a book or an article, containing additional information.
  3. 3
    The vermiform appendix.
  4. 4
    Any process, prolongation, or projection.

Recorded use

Wiktionary examples

These source excerpts show how appendix appears in context. They illustrate usage; the definition above remains the entry’s reference meaning.

  1. Near-synonyms: ancillary, auxiliary
  2. idleness is an appendix to nobility; they count it a disgrace to work, and spend all their days in sports, recreations, and pastimes […]

Etymology

Borrowed from Latin appendix.

This word in other languages

apéndice(Español)annexe(Français)Anhang(Deutsch)apêndice(Português)

Common misspellings

Also misspelled as:

  • apendix
  • apepndix
  • appednix
  • appenddix
  • appendixx
  • appendxi
  • appenidx
  • appenndix
  • appnedix
  • papendix

Misspelling Pattern Breakdown

How far each generated variant is from the correct spelling of appendix - measured in single-character edits (insert, delete, or substitute a letter). Larger bars are easier to catch; one-edit slips are the sneakiest.

apendix1apepndix2appednix2appenddix1appendixx1appendxi2appenidx2appenndix1
Edit distance from "appendix"

Definitions, pronunciation, and etymology for this entry are drawn from Wiktionary via the kaikki.org structured extract (CC BY-SA); frequency ordering uses the FrequencyWords open word-frequency list (2018 English corpus, MIT). See the methodology for how each field is sourced and updated.

Frequently Asked Questions

How do you spell "appendix"?
"appendix" is spelled A-P-P-E-N-D-I-X. The IPA pronunciation is /əˈpɛn.dɪks/.
What does "appendix" mean?
As a noun, "appendix" means: Something attached to something else; an attachment or accompaniment.
What words are commonly confused with "appendix"?
"appendix" is commonly confused with "append". These words look or sound similar but have different meanings. PlainSpell provides detailed comparisons for each pair.
How do you pronounce "appendix"?
The IPA (International Phonetic Alphabet) transcription for "appendix" is /əˈpɛn.dɪks/. Click the speaker icon on the pronunciation badge above to hear it spoken aloud where audio is available.
What is the origin of the word "appendix"?
Borrowed from Latin appendix. See the full etymology section above for more details.
Is PlainSpell free to use?
Yes, PlainSpell is a completely free word reference. You can look up definitions, pronunciations, confusable pairs, homophones, and spelling corrections across 5 languages without any sign-up or subscription.

Similar English words by spelling shape

Same letter count and similar misspelling depth for "appendix", not the corpus desk frequency band.

Same letter count

Frequency-ranked English headwords with 8 letters (nearest by frequency rank).

anterior#14,691behaving#14,701brethren#14,708wrestler#14,674

Similar misspelling depth

Headwords with a similar count of attested misspellings (10 here; floor ≥5).

angular10 variantsbarking10 variantsbrandy10 variantscarving10 variants

Source: Wiktionary (via kaikki.org) Structured Wiktionary extract

Source: FrequencyWords open word-frequency list