ubiquitin
/juːˈbɪkwɪtɪn/
"ubiquitin" is a 9-letter English headword indexed on PlainSpell.
The verdict
“ubiquitin” is uncommon English (frequency #67,914 among 23,789 “U” headwords), classed as a noun. The kind of spelling people second-guess.
- #67,914
- frequency rank, English
- 23,789
- “U” headwords
According to Wiktionary data (CC BY-SA, analyzed May 6, 2026) - Any of a class of small protein, or polypeptide, present in the cells of all eukaryotes, that play a part in modifying and degrading proteins.
| Property | Value |
|---|---|
| Headword | ubiquitin |
| Language | English |
| Part of speech | Noun |
| IPA | /juːˈbɪkwɪtɪn/ |
| Letters | 9 |
| Frequency rank | #67,914 |
| Misspellings tracked | 0 |
| Confusable pairs | 0 |
| Source | Wiktionary (kaikki.org) |
Where “ubiquitin” sits in English frequency
Rare enough to double-check
ubiquitin is uncommon English at frequency #67,914 among 23,789 “U” headwords, classed as anoun, transcribed /juːˈbɪkwɪtɪn/. Rarity is why readers land here mid-draft. Gloss: "Any of a class of small protein, or polypeptide, present in the cells of all eukaryotes, that play a part in modifying and degrading proteins.".
ubiquitin has no tracked misspelling variants, and the word's spelling is regular enough that our generator found nothing worth flagging. No confusable counterpart is on file for this word, suggesting its spelling stands apart enough that readers rarely confuse it with something else.
Etymologically, the entry records: From ubiquitous + -in. The correct English form is ubiquitin, spelled U-B-I-Q-U-I-T-I-N.
Definition
- 1Any of a class of small protein, or polypeptide, present in the cells of all eukaryotes, that play a part in modifying and degrading proteins.
Etymology
From ubiquitous + -in.
This word in other languages
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
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Using “ubiquitin”
The practical upshot for anyone who landed here from a spell-check.
- The one correct English spelling is U-B-I-Q-U-I-T-I-N - every other letter order is a misspelling in standard orthography.
- Say it as /juːˈbɪkwɪtɪn/ (IPA); tap the speaker on the pronunciation badge to hear it where audio exists.
- Browse more English words and confusable pairs in the same reference. English words
Other uncommon English words near this rank
Data Source
Wiktionary (via kaikki.org), licensed under CC BY-SA & GFDL. Word ordering uses an open word-frequency list; misspelling variants are generated by edit-distance from the correct headword.