achromatopsia
/ˈə.kɹɒ.mə.tɒp.siə/
"achromatopsia" is a 13-letter English headword indexed on PlainSpell.
The verdict
“achromatopsia” is uncommon English (outside the top frequency list), classed as a noun. The kind of spelling people second-guess.
- Unranked
- below top-frequency English
- 13
- letters
According to Wiktionary data (CC BY-SA, analyzed September 3, 2026) - Total color blindness; the total inability to distinguish colors due to the absence of cone cells in the eyes.
Corpus desk
Index EN-achromatopsia · achromatopsia · English
achromatopsia · unranked · 0 variants · 0 confusables
- FREQ-UNRANKED Unranked
- LEN-MEGA 13 letters
- VOW-6 6 vowels
- CONFUS-0 No pairs
- VAR-0 0 variants
- BOOK-THIN "A" 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 | achromatopsia |
| Language | English |
| Part of speech | Noun |
| IPA | /ˈə.kɹɒ.mə.tɒp.siə/ |
| Letters | 13 |
| Misspellings tracked | 0 |
| Confusable pairs | 0 |
| Source | Wiktionary (kaikki.org) |
Long-tail rank of “achromatopsia” in English
Rare enough to double-check
achromatopsia is uncommon English outside the top frequency list, classed as anoun, transcribed /ˈə.kɹɒ.mə.tɒp.siə/. Rarity is why readers land here mid-draft. Gloss: "Total color blindness; the total inability to distinguish colors due to the absence of cone cells in the eyes.".
The misspelling generator found no plausible variants for achromatopsia, typically a sign the spelling maps closely to how the word sounds. No confusable counterpart is on file for this word, which typically means the spelling is too distinctive to be mistaken for another word.
Etymologically, the entry records: From German Achromatopsie, from Ancient Greek ἀχρώματος (akhrṓmatos), from ἀ- (a-, “without”) + χρῶμα (khrôma, “color”), + -opsie. By surface analysis, a- + chromato- + -opsia. The correct English form is achromatopsia, spelled A-C-H-R-O-M-A-T-O-P-S-I-A.
Definition
- 1Total color blindness; the total inability to distinguish colors due to the absence of cone cells in the eyes.
Etymology
From German Achromatopsie, from Ancient Greek ἀχρώματος (akhrṓmatos), from ἀ- (a-, “without”) + χρῶμα (khrôma, “color”), + -opsie. By surface analysis, a- + chromato- + -opsia.
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.