monoxide

/məˈnɒksʌɪd/

//məˈnɒksʌɪd// noun

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

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

The verdict

“monoxide” has 11 generated spelling variants in the English index at frequency #20,435. The variants make it a useful spelling check.

#20,435
frequency rank, English
4,057
“M” headwords
11
tracked misspellings

According to Wiktionary data (CC BY-SA, analyzed September 3, 2026) - Any oxide containing a single oxygen atom in each molecule or formula unit.

Corpus desk

Index EN-monoxide · monoxide · English

monoxide · rank #20,435 · 11 variants · 0 confusables

  • FREQ-MID #20,435
  • LEN-LONG 8 letters
  • VOW-4 4 vowels
  • CONFUS-0 No pairs
  • VAR-MID 11 variants
  • BOOK-MID 4,057
  • PHOTO-FINISH monologue

Nearest frequency peer: monologue (-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 “monoxide”

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

corpus weight

What this shows “monoxide” 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
Key facts for monoxide
PropertyValue
Headwordmonoxide
LanguageEnglish
Part of speechNoun
IPA/məˈnɒksʌɪd/
Letters8
Frequency rank#20,435
Misspellings tracked11
Confusable pairs0
SourceWiktionary (kaikki.org)

Frequency seat of misspelling magnet “monoxide”

Every-word frequency runs from the handful of words we use constantly (left) to the long tail used once in a blue moon (right).monoxidelands here:

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

Scale is logarithmic (each tick is 10× rarer). Same rarity band neighbours include “monologue” (#20,434), “Mosul” (#20,436), “mobilization” (#20,433). Among 4,057 “M” headwords, “monoxide” is #20,435. Source: FrequencyWords open word-frequency list.

A misspelling magnet

The generator records 11 spelling variants around monoxide (IPA /məˈnɒksʌɪd/), anoun. Corpus frequency is #20,435 among 4,057 “M” headwords. Dominant gloss: "Any oxide containing a single oxygen atom in each molecule or formula unit.".

Our generated misspelling index lists 11 likely wrong-spelling variants for monoxide, with forms such as "mmonoxide", "mnooxide", and "monnoxide". Each variant is a distinct typo pattern an edit-distance generator flags, typically a doubled-consonant error, a silent-letter drop, or a vowel substitution. This entry stands alone in our confusable dataset, since nothing in our dataset looks or sounds close enough to cause mix-ups.

Etymologically, the entry records: Formed as mon- + oxide; compare the earlier dioxide, pentoxide, and tetroxide. The correct English form is monoxide, spelled M-O-N-O-X-I-D-E.

Definition

  1. 1
    Any oxide containing a single oxygen atom in each molecule or formula unit.

Recorded use

Wiktionary example

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

  1. A process for preparing normally solid high molecular weight, hydrocarbon polymers which comprises heating and reacting carbon monoxide with hydrogen at a temperature of 125 ° to 350 °C, under a pressure of at least 30 atmospheres and in contact with a phosphomolybdic compound represented by the formula P₂Mo_(20–24)O_(2–60).

Etymology

Formed as mon- + oxide; compare the earlier dioxide, pentoxide, and tetroxide.

This word in other languages

monóxido(Español)protoxyde(Français)Oxydul(Deutsch)

Common misspellings

Also misspelled as:

  • mmonoxide
  • mnooxide
  • monnoxide
  • monoixde
  • monoxdie
  • monoxidde
  • monoxied
  • monoxxide
  • monxoide
  • moonxide
  • omnoxide

Misspelling Pattern Breakdown

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

mmonoxide1mnooxide2monnoxide1monoixde2monoxdie2monoxidde1monoxied2monoxxide1
Edit distance from "monoxide"

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 "monoxide"?
"monoxide" is spelled M-O-N-O-X-I-D-E. The IPA pronunciation is /məˈnɒksʌɪd/.
What does "monoxide" mean?
As a noun, "monoxide" means: Any oxide containing a single oxygen atom in each molecule or formula unit.
What are common misspellings of "monoxide"?
Common misspellings include "mmonoxide", "mnooxide", "monnoxide", "monoixde", "monoxdie". The correct spelling is "monoxide".
How do you pronounce "monoxide"?
The IPA (International Phonetic Alphabet) transcription for "monoxide" is /məˈnɒksʌɪd/. 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 "monoxide"?
Formed as mon- + oxide; compare the earlier dioxide, pentoxide, and tetroxide. 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 "monoxide", not the corpus desk frequency band.

Same letter count

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

merciful#20,425lymphoma#20,422outweigh#20,451literate#20,415

Similar misspelling depth

Headwords with a similar count of attested misspellings (11 here; floor ≥5).

parsley11 variantspotency11 variantsPresley11 variantspretext11 variants

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

Source: FrequencyWords open word-frequency list