theine
/ˈθiː.iːn/
"theine" is a 6-letter English headword indexed on PlainSpell.
The verdict
“theine” is uncommon English (outside the top frequency list), classed as a noun. The kind of spelling people second-guess.
- Unranked
- below top-frequency English
- 6
- letters
According to Wiktionary data (CC BY-SA, analyzed September 3, 2026) - Caffeine when present in tea.
Corpus desk
Index EN-theine · theine · English
theine · unranked · 0 variants · 0 confusables
- FREQ-UNRANKED Unranked
- LEN-LONG 6 letters
- VOW-3 3 vowels
- CONFUS-0 No pairs
- VAR-0 0 variants
- BOOK-THIN "T" thin
- PHOTO-UNK Peer pending
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.
| Property | Value |
|---|---|
| Headword | theine |
| Language | English |
| Part of speech | Noun |
| IPA | /ˈθiː.iːn/ |
| Letters | 6 |
| Misspellings tracked | 0 |
| Confusable pairs | 0 |
| Source | Wiktionary (kaikki.org) |
Long-tail rank of “theine” in English
Rare enough to double-check
theine is uncommon English outside the top frequency list, classed as anoun, transcribed /ˈθiː.iːn/. Rarity is why readers land here mid-draft. Gloss: "Caffeine when present in tea.".
theine has no tracked misspelling variants, and the word's spelling is regular enough that our generator found nothing worth flagging. 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 French théine. The correct English form is theine, spelled T-H-E-I-N-E.
Definition
- 1Caffeine when present in tea.
Recorded use
Wiktionary exampleThese source excerpts show how theine appears in context. They illustrate usage; the definition above remains the entry’s reference meaning.
Caffeine is called guaranine when found in guarana, mateine when found in mate and theine when found in tea. There is far more caffeine in coffees than in teas.
Etymology
From French théine.
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). See the methodology for how each field is sourced and updated.