cysteine
/ˈsɪs.təˌiːn/
"cysteine" is a 8-letter English headword indexed on PlainSpell.
The verdict
“cysteine” has 12 generated spelling variants in the English index at frequency #43,590. The variants make it a useful spelling check.
- #43,590
- frequency rank, English
- 43,570
- “C” headwords
- 12
- tracked misspellings
According to Wiktionary data (CC BY-SA, analyzed May 6, 2026) - A sulphur-containing nonessential amino acid C₃H₇NO₂S found in most animal proteins; it readily oxidizes to cystine.
Corpus desk
Index EN-cysteine · cysteine · English
cysteine · rank #43,590 · 12 variants · 0 confusables
- FREQ-MID #43,590
- LEN-LONG 8 letters
- VOW-4 4 vowels
- CONFUS-0 No pairs
- VAR-MID 12 variants
- BOOK-DENSE 43,570
- PHOTO-FINISH cushy
Nearest frequency peer: cushy (-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 “cysteine”
Lower corpus rank = more everyday usage (inverted bar length for readability)
- cuck
cuck
56,415 corpus weight
- curable
curable
56,414 corpus weight
- curative
curative
56,413 corpus weight
- cushy
cushy
56,412 corpus weight
- cysteine
cysteine
56,411 corpus weight
- Dalmatian
Dalmatian
56,410 corpus weight
What this shows Bars show where “cysteine” sits against the nearest ranked English headwords in the FrequencyWords band, not a reprint of letter-browse containment.
| Property | Value |
|---|---|
| Headword | cysteine |
| Language | English |
| Part of speech | Noun |
| IPA | /ˈsɪs.təˌiːn/ |
| Letters | 8 |
| Frequency rank | #43,590 |
| Misspellings tracked | 12 |
| Confusable pairs | 0 |
| Source | Wiktionary (kaikki.org) |
Where “cysteine” sits in English frequency
A misspelling magnet
The generator records 12 spelling variants around cysteine (IPA /ˈsɪs.təˌiːn/), anoun. Corpus frequency is #43,590 among 43,570 “C” headwords. Dominant gloss: "A sulphur-containing nonessential amino acid C₃H₇NO₂S found in most animal proteins; it readily oxidizes to cystine.".
Our generated misspelling index lists 12 likely wrong-spelling variants for cysteine, with forms such as "ccysteine", "csyteine", and "cysetine". Every one of these variants traces to a single-character edit -- an added or dropped letter, a swapped consonant, or a vowel swap -- the kind of slip a spell-checker is built to catch. No confusable counterpart is on file for this word, a sign it's visually distinctive enough not to be mixed up with another word.
Etymologically, the entry records: An alteration of cystine, see -eine. The correct English form is cysteine, spelled C-Y-S-T-E-I-N-E.
Definition
- 1A sulphur-containing nonessential amino acid C₃H₇NO₂S found in most animal proteins; it readily oxidizes to cystine.
Etymology
An alteration of cystine, see -eine.
Synonyms
This word in other languages
Common misspellings
Also misspelled as:
- ccysteine
- csyteine
- cysetine
- cyssteine
- cysteien
- cysteinne
- cystenie
- cystiene
- cystteine
- cytseine
- cyysteine
- ycsteine
Misspelling Pattern Breakdown
How far each generated variant is from the correct spelling of cysteine - measured in single-character edits (insert, delete, or substitute a letter). Larger bars are easier to catch; one-edit slips are the sneakiest.
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
How do you spell "cysteine"?
What does "cysteine" mean?
What are common misspellings of "cysteine"?
How do you pronounce "cysteine"?
What is the origin of the word "cysteine"?
Is PlainSpell free to use?
Similar English words by spelling shape
Same letter count and similar misspelling depth for "cysteine", not the corpus desk frequency band.
Same letter count
Frequency-ranked English headwords with 8 letters (nearest by frequency rank).
Similar misspelling depth
Headwords with a similar count of attested misspellings (12 here; floor ≥5).
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.