Daltonism
/ˈdɔːltənɪzəm/
"daltonism" is a 9-letter English headword indexed on PlainSpell.
The verdict
“Daltonism” is uncommon English (outside the top frequency list), classed as a noun. The kind of spelling people second-guess.
- Unranked
- below top-frequency English
- 9
- letters
According to Wiktionary data (CC BY-SA, analyzed September 3, 2026) - An inability or defective ability to perceive or distinguish certain colors, especially red-green color blindness.
Corpus desk
Index EN-daltonism · Daltonism · English
Daltonism · unranked · 0 variants · 0 confusables
- FREQ-UNRANKED Unranked
- LEN-LONG 9 letters
- VOW-3 3 vowels
- CONFUS-0 No pairs
- VAR-0 0 variants
- BOOK-THIN "D" 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 | Daltonism |
| Language | English |
| Part of speech | Noun |
| IPA | /ˈdɔːltənɪzəm/ |
| Letters | 9 |
| Misspellings tracked | 0 |
| Confusable pairs | 0 |
| Source | Wiktionary (kaikki.org) |
Long-tail rank of “Daltonism” in English
Rare enough to double-check
Daltonism is uncommon English outside the top frequency list, classed as anoun, transcribed /ˈdɔːltənɪzəm/. Rarity is why readers land here mid-draft. 2 senses are on record.
No generated misspelling entries exist for Daltonism in our index, typically a sign the spelling maps closely to how the word sounds. No confusable counterpart is on file for this word, since no other headword is close enough in sound or shape to pair with it.
Etymologically, the entry records: From Dalton + -ism. Named after John Dalton (1766–1844), who suffered from the condition and conducted early research on it. The correct English form is Daltonism, spelled D-A-L-T-O-N-I-S-M.
Definition
- 1An inability or defective ability to perceive or distinguish certain colors, especially red-green color blindness.
- 2Achromatopsia.
Recorded use
Wiktionary examplesThese source excerpts show how Daltonism appears in context. They illustrate usage; the definition above remains the entry’s reference meaning.
A person with Daltonism may be said to lack a discriminatory power that others have: his perceptions of red and green are, as such, not to be relied on.
The Ishihara plates were developed for the assessment of congenital colour anomalies (Daltonism) and so there is considerable detail in the testing that is not relevant to optic nerve disease where the losses do not follow the specific patterns seen in Daltonism but show largely global losses.
Etymology
From Dalton + -ism. Named after John Dalton (1766–1844), who suffered from the condition and conducted early research on it.
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). See the methodology for how each field is sourced and updated.