millimicron
"millimicron" is a 11-letter English headword indexed on PlainSpell.
The verdict
“millimicron” is uncommon English (outside the top frequency list), classed as a noun. The kind of spelling people second-guess.
- Unranked
- below top-frequency English
- 11
- letters
According to Wiktionary data (CC BY-SA, analyzed May 6, 2026) - A unit of length equal to one thousandth of a micron.
| Property | Value |
|---|---|
| Headword | millimicron |
| Language | English |
| Part of speech | Noun |
| Letters | 11 |
| Misspellings tracked | 0 |
| Confusable pairs | 0 |
| Source | Wiktionary (kaikki.org) |
Where “millimicron” sits in English frequency
Rare enough to double-check
millimicron is uncommon English outside the top frequency list, classed as anoun. Rarity is why readers land here mid-draft. Gloss: "A unit of length equal to one thousandth of a micron.".
We couldn't generate a plausible misspelling set for millimicron, typically a sign the spelling maps closely to how the word sounds. Our confusable-pair dataset has no match for it, since nothing in our dataset looks or sounds close enough to cause mix-ups.
Etymologically, the entry records: From milli- + micron. The correct English form is millimicron, spelled M-I-L-L-I-M-I-C-R-O-N.
Definition
- 1A unit of length equal to one thousandth of a micron.
Etymology
From milli- + micron.
Definitions, pronunciation, and etymology for this entry are drawn from Wiktionary via the kaikki.org structured extract (CC BY-SA). See the methodology for how each field is sourced and updated.
Frequently Asked Questions
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Using “millimicron”
The practical upshot for anyone who landed here from a spell-check.
- The one correct English spelling is M-I-L-L-I-M-I-C-R-O-N - every other letter order is a misspelling in standard orthography.
- Browse more English words and confusable pairs in the same reference. English words
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.