omicron
/ˈɒmɪkɹɒn/
"omicron" is a 7-letter English headword indexed on PlainSpell.
The verdict
“omicron” is uncommon English (frequency #63,118 among 1,431 “O” headwords), classed as a noun. The kind of spelling people second-guess.
- #63,118
- frequency rank, English
- 1,431
- “O” headwords
According to Wiktionary data (CC BY-SA, analyzed September 3, 2026) - The 15th letter of the Classical and Modern Greek alphabets (16th in Ancient and Old Greek), used in ordering lists as in naming (astronomy) the 15th star of a constellation or (epidemiology) the 1...
Corpus desk
Index EN-omicron · omicron · English
omicron · rank #63,118 · 0 variants · 0 confusables
- FREQ-RARE #63,118
- LEN-LONG 7 letters
- VOW-3 3 vowels
- CONFUS-0 No pairs
- VAR-0 0 variants
- BOOK-MID 1,431
- PHOTO-FINISH Orbison
Nearest frequency peer: Orbison (+2 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.
Long-tail ranks near “omicron”
Sparse band: bars invert rank so rarer forms read shorter
- obvs
obvs
36,888 corpus weight
- oesophagus
oesophagus
36,887 corpus weight
- omicron
omicron
36,883 corpus weight
- Orbison
Orbison
36,881 corpus weight
- oriole
oriole
36,880 corpus weight
- overconfide…
overconfidence
36,877 corpus weight
What this shows Long-tail view: where “omicron” sits against similarly uncommon English ranks.
| Property | Value |
|---|---|
| Headword | omicron |
| Language | English |
| Part of speech | Noun |
| IPA | /ˈɒmɪkɹɒn/ |
| Letters | 7 |
| Frequency rank | #63,118 |
| Misspellings tracked | 0 |
| Confusable pairs | 0 |
| Source | Wiktionary (kaikki.org) |
Long-tail rank of “omicron” in English
Rare enough to double-check
omicron is uncommon English at frequency #63,118 among 1,431 “O” headwords, classed as anoun, transcribed /ˈɒmɪkɹɒn/. Rarity is why readers land here mid-draft. Gloss: "The 15th letter of the Classical and Modern Greek alphabets (16th in Ancient and Old Greek), used in ordering lists as in naming (astronomy) the 15th star of a constellation or (epidemiology) the 1...".
omicron doesn't appear in our generated misspelling index, since its letter sequence doesn't invite the usual edit-distance slips. No confusable counterpart is on file for this word, since nothing in our dataset looks or sounds close enough to cause mix-ups.
Etymologically, the entry records: From Latin omicron, from Koine Greek ὂ μῑκρόν (ò mīkrón, “little o”), named in contrast with omega (“big o”). The uncommon form omicra is similarly borrowed from Latin and Greek. The use for designating stars in a constellation—typically in order of apparen… The correct English form is omicron, spelled O-M-I-C-R-O-N.
Definition
- 1The 15th letter of the Classical and Modern Greek alphabets (16th in Ancient and Old Greek), used in ordering lists as in naming (astronomy) the 15th star of a constellation or (epidemiology) the 15th discovered major variant of a disease.
Recorded use
Wiktionary examplesThese source excerpts show how omicron appears in context. They illustrate usage; the definition above remains the entry’s reference meaning.
Your Majestie knows that unfortunate I [...] was the first who when I published my Poem of Italia Liberata endeavoured to bring the Omicron, Eupselon, Omega, and other Greek Letters, which I thought very requisite for that language, into my own Tongue;
The E serves both for the Epsilon and Eta; the O, both for the Omicron and Omega, and likewise for the dipthong OΥ.
Etymology
From Latin omicron, from Koine Greek ὂ μῑκρόν (ò mīkrón, “little o”), named in contrast with omega (“big o”). The uncommon form omicra is similarly borrowed from Latin and Greek. The use for designating stars in a constellation—typically in order of apparent brightness—began with Johann Bayer's 1603 Uranometria.
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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Similar English words by spelling shape
Same letter count and similar misspelling depth for "omicron", not the corpus desk frequency band.
Same letter count
Frequency-ranked English headwords with 7 letters (nearest by frequency rank).