tretinoin
/tɹəˈtɪn.əʊ.ɪn/
"tretinoin" is a 9-letter English headword indexed on PlainSpell.
The verdict
“tretinoin” is uncommon English (frequency #82,867 among 3,151 “T” headwords), classed as a noun. The kind of spelling people second-guess.
- #82,867
- frequency rank, English
- 3,151
- “T” headwords
According to Wiktionary data (CC BY-SA, analyzed September 3, 2026) - The all-trans isomer of retinoic acid that is applied to the skin to treat severe acne and reduce facial wrinkles, roughness, and pigmented spots.
Corpus desk
Index EN-tretinoin · tretinoin · English
tretinoin · rank #82,867 · 0 variants · 0 confusables
- FREQ-RARE #82,867
- LEN-LONG 9 letters
- VOW-4 4 vowels
- CONFUS-0 No pairs
- VAR-0 0 variants
- BOOK-MID 3,151
- PHOTO-FINISH tricyclic
Nearest frequency peer: tricyclic (+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.
Long-tail ranks near “tretinoin”
Sparse band: bars invert rank so rarer forms read shorter
- transpirati…
transpiration
17,137 corpus weight
- transposing
transposing
17,136 corpus weight
- tretinoin
tretinoin
17,134 corpus weight
- tricyclic
tricyclic
17,133 corpus weight
- triforce
triforce
17,132 corpus weight
- triste
triste
17,131 corpus weight
What this shows Long-tail view: where “tretinoin” sits against similarly uncommon English ranks.
| Property | Value |
|---|---|
| Headword | tretinoin |
| Language | English |
| Part of speech | Noun |
| IPA | /tɹəˈtɪn.əʊ.ɪn/ |
| Letters | 9 |
| Frequency rank | #82,867 |
| Misspellings tracked | 0 |
| Confusable pairs | 0 |
| Source | Wiktionary (kaikki.org) |
Long-tail rank of “tretinoin” in English
Rare enough to double-check
tretinoin is uncommon English at frequency #82,867 among 3,151 “T” headwords, classed as anoun, transcribed /tɹəˈtɪn.əʊ.ɪn/. Rarity is why readers land here mid-draft. Gloss: "The all-trans isomer of retinoic acid that is applied to the skin to treat severe acne and reduce facial wrinkles, roughness, and pigmented spots.".
We couldn't generate a plausible misspelling set for tretinoin, which points to an orthography that plays by predictable English rules. It is not paired with a close-neighbour confusable in our dataset, a sign it's visually distinctive enough not to be mixed up with another word.
Etymologically, the entry records: From tr(ans)- + retino(ic acid) + -in. The correct English form is tretinoin, spelled T-R-E-T-I-N-O-I-N.
Definition
- 1The all-trans isomer of retinoic acid that is applied to the skin to treat severe acne and reduce facial wrinkles, roughness, and pigmented spots.
Etymology
From tr(ans)- + retino(ic acid) + -in.
Synonyms
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 "tretinoin", not the corpus desk frequency band.
Same letter count
Frequency-ranked English headwords with 9 letters (nearest by frequency rank).