leucine
/ˈluː.siːn/
"leucine" is a 7-letter English headword indexed on PlainSpell.
The verdict
“leucine” is uncommon English (frequency #57,517 among 2,297 “L” headwords), classed as a noun. The kind of spelling people second-guess.
- #57,517
- frequency rank, English
- 2,297
- “L” headwords
According to Wiktionary data (CC BY-SA, analyzed September 3, 2026) - An essential amino acid, C₆H₁₃NO₂, isomeric with isoleucine, found in most animal proteins; it is essential for growth in children.
Corpus desk
Index EN-leucine · leucine · English
leucine · rank #57,517 · 0 variants · 0 confusables
- FREQ-RARE #57,517
- LEN-LONG 7 letters
- VOW-4 4 vowels
- CONFUS-0 No pairs
- VAR-0 0 variants
- BOOK-MID 2,297
- PHOTO-FINISH lemongrass
Nearest frequency peer: lemongrass (-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 “leucine”
Sparse band: bars invert rank so rarer forms read shorter
- leant
leant
42,488 corpus weight
- legalise
legalise
42,487 corpus weight
- lemongrass
lemongrass
42,485 corpus weight
- leucine
leucine
42,484 corpus weight
- lineal
lineal
42,482 corpus weight
- Lipman
Lipman
42,481 corpus weight
What this shows Long-tail view: where “leucine” sits against similarly uncommon English ranks.
| Property | Value |
|---|---|
| Headword | leucine |
| Language | English |
| Part of speech | Noun |
| IPA | /ˈluː.siːn/ |
| Letters | 7 |
| Frequency rank | #57,517 |
| Misspellings tracked | 0 |
| Confusable pairs | 0 |
| Source | Wiktionary (kaikki.org) |
Long-tail rank of “leucine” in English
Rare enough to double-check
leucine is uncommon English at frequency #57,517 among 2,297 “L” headwords, classed as anoun, transcribed /ˈluː.siːn/. Rarity is why readers land here mid-draft. Gloss: "An essential amino acid, C₆H₁₃NO₂, isomeric with isoleucine, found in most animal proteins; it is essential for growth in children.".
No misspelling variants are generated for leucine in our index, suggesting the orthography follows predictable English patterns. No close-neighbour confusable shows up for this headword in our dataset, suggesting its spelling stands apart enough that readers rarely confuse it with something else.
Etymologically, the entry records: Derived from Ancient Greek λευκός (leukós, “white”) + -ine, equivalent to leuco- + -ine. The correct English form is leucine, spelled L-E-U-C-I-N-E.
Definition
- 1An essential amino acid, C₆H₁₃NO₂, isomeric with isoleucine, found in most animal proteins; it is essential for growth in children.
Recorded use
Wiktionary exampleThese source excerpts show how leucine appears in context. They illustrate usage; the definition above remains the entry’s reference meaning.
Thus, leucine is already being seen as a pharmaconutrient of great relevance for the supplementary feeding of malnourished and frail elderly and for specific subpopulations.
Etymology
Derived from Ancient Greek λευκός (leukós, “white”) + -ine, equivalent to leuco- + -ine.
Synonyms
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.
Frequently Asked Questions
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Similar English words by spelling shape
Same letter count and similar misspelling depth for "leucine", not the corpus desk frequency band.
Same letter count
Frequency-ranked English headwords with 7 letters (nearest by frequency rank).