formalin
"formalin" is a 8-letter English headword indexed on PlainSpell.
The verdict
“formalin” is uncommon English (frequency #79,524 among 18,613 “F” headwords), classed as a noun. The kind of spelling people second-guess.
- #79,524
- frequency rank, English
- 18,613
- “F” headwords
According to Wiktionary data (CC BY-SA, analyzed May 6, 2026) - A solution of formaldehyde in water; used as a disinfectant and to preserve biological specimens.
Corpus desk
Index EN-formalin · formalin · English
formalin · rank #79,524 · 0 variants · 0 confusables
- FREQ-RARE #79,524
- LEN-LONG 8 letters
- VOW-3 3 vowels
- CONFUS-0 No pairs
- VAR-0 0 variants
- BOOK-DENSE 18,613
- PHOTO-FINISH Frankl
Nearest frequency peer: Frankl (+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.
Frequency neighbourhood for “formalin”
Lower corpus rank = more everyday usage (inverted bar length for readability)
- formalin
formalin
20,477 corpus weight
- Frankl
Frankl
20,476 corpus weight
- fuckwit
fuckwit
20,475 corpus weight
- Fujimoto
Fujimoto
20,474 corpus weight
- fulsome
fulsome
20,473 corpus weight
- functor
functor
20,472 corpus weight
What this shows Bars show where “formalin” sits against the nearest ranked English headwords in the FrequencyWords band, not a reprint of letter-browse containment.
| Property | Value |
|---|---|
| Headword | formalin |
| Language | English |
| Part of speech | Noun |
| Letters | 8 |
| Frequency rank | #79,524 |
| Misspellings tracked | 0 |
| Confusable pairs | 0 |
| Source | Wiktionary (kaikki.org) |
Where “formalin” sits in English frequency
Rare enough to double-check
formalin is uncommon English at frequency #79,524 among 18,613 “F” headwords, classed as anoun. Rarity is why readers land here mid-draft. Gloss: "A solution of formaldehyde in water; used as a disinfectant and to preserve biological specimens.".
No generated misspelling entries exist for formalin in our index, and the word's spelling is regular enough that our generator found nothing worth flagging. This entry stands alone in our confusable dataset, a sign it's visually distinctive enough not to be mixed up with another word.
This headword's origin isn't recorded in our source data, so its spelling is best read as a straightforward mapping from sound to letter. The correct English form is formalin, spelled F-O-R-M-A-L-I-N.
Definition
- 1A solution of formaldehyde in water; used as a disinfectant and to preserve biological specimens.
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.
PlainSpell is rendered directly from structured Wiktionary extracts and open word-frequency lists, no number is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of May 6, 2026. Primary sources: Wiktionary (via kaikki.org) and FrequencyWords.
Frequently Asked Questions
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Similar English words by spelling shape
Same letter count and similar misspelling depth for "formalin", not the corpus desk frequency band.
Same letter count
Frequency-ranked English headwords with 8 letters (nearest by frequency 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.