5-hydroxytryptamine
"5-hydroxytryptamine" is a 17-letter English headword indexed on PlainSpell.
The verdict
“5-hydroxytryptamine” is uncommon English (outside the top frequency list), classed as a noun. The kind of spelling people second-guess.
- Unranked
- below top-frequency English
- 19
- letters
According to Wiktionary data (CC BY-SA, analyzed May 6, 2026) - The neurotransmitter serotonin.
| Property | Value |
|---|---|
| Headword | 5-hydroxytryptamine |
| Language | English |
| Part of speech | Noun |
| Letters | 19 |
| Misspellings tracked | 0 |
| Confusable pairs | 0 |
| Source | Wiktionary (kaikki.org) |
Where “5-hydroxytryptamine” sits in English frequency
Rare enough to double-check
5-hydroxytryptamine is uncommon English outside the top frequency list, classed as anoun. Rarity is why readers land here mid-draft. Gloss: "The neurotransmitter serotonin.".
Zero misspellings are on record for 5-hydroxytryptamine in our index, since its letter sequence doesn't invite the usual edit-distance slips. This entry stands alone in our confusable dataset, which tends to mean the word is visually distinctive enough to stand on its own.
Etymologically, the entry records: It is a tryptamine with a hydroxyl group attached to the carbon atom that is numbered as 5. The correct English form is 5-hydroxytryptamine, spelled 5---H-Y-D-R-O-X-Y-T-R-Y-P-T-A-M-I-N-E.
Definition
- 1The neurotransmitter serotonin.
Etymology
It is a tryptamine with a hydroxyl group attached to the carbon atom that is numbered as 5.
Synonyms
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 “5-hydroxytryptamine”
The practical upshot for anyone who landed here from a spell-check.
- The one correct English spelling is 5---H-Y-D-R-O-X-Y-T-R-Y-P-T-A-M-I-N-E - 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.