erythematosus

/ˌɛɹɪˈθiːməˌtəʊsɪs/

//ˌɛɹɪˈθiːməˌtəʊsɪs// noun

By · According to Wiktionary data (CC BY-SA) ·

"erythematosus" is a 13-letter English headword indexed on PlainSpell.

The verdict

“erythematosus” is uncommon English (frequency #72,282 among 2,246 “E” headwords), classed as a noun. The kind of spelling people second-guess.

#72,282
frequency rank, English
2,246
“E” headwords

According to Wiktionary data (CC BY-SA, analyzed September 3, 2026) - An eruption of red lesions.

Corpus desk

Index EN-erythematosus · erythematosus · English

erythematosus · rank #72,282 · 0 variants · 0 confusables

  • FREQ-RARE #72,282
  • LEN-MEGA 13 letters
  • VOW-6 6 vowels
  • CONFUS-0 No pairs
  • VAR-0 0 variants
  • BOOK-MID 2,246
  • PHOTO-FINISH Euromaidan

Nearest frequency peer: Euromaidan (+3 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 “erythematosus”

Sparse band: bars invert rank so rarer forms read shorter

corpus weight

What this shows Long-tail view: where “erythematosus” sits against similarly uncommon English ranks.

Source FrequencyWords open word-frequency list As of September 3, 2026
Key facts for erythematosus
PropertyValue
Headworderythematosus
LanguageEnglish
Part of speechNoun
IPA/ˌɛɹɪˈθiːməˌtəʊsɪs/
Letters13
Frequency rank#72,282
Misspellings tracked0
Confusable pairs0
SourceWiktionary (kaikki.org)

Long-tail rank of “erythematosus” in English

Every-word frequency runs from the handful of words we use constantly (left) to the long tail used once in a blue moon (right).erythematosusfalls in this rarity band:

#1#100#1K#10K#100K
← used constantlyrarely used →

The axis is logarithmic, with each marked tick roughly ten times rarer than the last. Rare peers in the same band: “Euromaidan” (#72,285), “entrancing” (#72,278), “Europol” (#72,286). Among 2,246 “E” headwords, “erythematosus” is #72,282. Source: FrequencyWords open word-frequency list.

Rare enough to double-check

erythematosus is uncommon English at frequency #72,282 among 2,246 “E” headwords, classed as anoun, transcribed /ˌɛɹɪˈθiːməˌtəʊsɪs/. Rarity is why readers land here mid-draft. Gloss: "An eruption of red lesions.".

erythematosus doesn't appear in our generated misspelling index, suggesting the orthography follows predictable English patterns. It is not paired with a close-neighbour confusable in our dataset, suggesting its spelling stands apart enough that readers rarely confuse it with something else.

Etymologically, the entry records: From Ancient Greek ἐρύθημα (erúthēma, “a redness or flush on the skin”), from ἐρυθρός (eruthrós, “red”). The German form erythematodes is arguably the preferred correct form. The correct English form is erythematosus, spelled E-R-Y-T-H-E-M-A-T-O-S-U-S.

Definition

  1. 1
    An eruption of red lesions.

Recorded use

Wiktionary example

These source excerpts show how erythematosus appears in context. They illustrate usage; the definition above remains the entry’s reference meaning.

  1. Iberdomide, a cereblon modulator promoting degradation of the transcription factors Ikaros and Aiolos, which affect leukocyte development and autoimmunity, is being evaluated for the treatment of systemic lupus erythematosus (SLE).

Etymology

From Ancient Greek ἐρύθημα (erúthēma, “a redness or flush on the skin”), from ἐρυθρός (eruthrós, “red”). The German form erythematodes is arguably the preferred correct form.

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

How do you spell "erythematosus"?
"erythematosus" is spelled E-R-Y-T-H-E-M-A-T-O-S-U-S. The IPA pronunciation is /ˌɛɹɪˈθiːməˌtəʊsɪs/.
What does "erythematosus" mean?
As a noun, "erythematosus" means: An eruption of red lesions.
How do you pronounce "erythematosus"?
The IPA (International Phonetic Alphabet) transcription for "erythematosus" is /ˌɛɹɪˈθiːməˌtəʊsɪs/. Click the speaker icon on the pronunciation badge above to hear it spoken aloud where audio is available.
What is the origin of the word "erythematosus"?
From Ancient Greek ἐρύθημα (erúthēma, “a redness or flush on the skin”), from ἐρυθρός (eruthrós, “red”). The German form erythematodes is arguably the preferred correct form. See the full etymology section above for more details.
Is PlainSpell free to use?
Yes, PlainSpell is a completely free word reference. You can look up definitions, pronunciations, confusable pairs, homophones, and spelling corrections across 5 languages without any sign-up or subscription.

Similar English words by spelling shape

Same letter count and similar misspelling depth for "erythematosus", not the corpus desk frequency band.

Same letter count

Frequency-ranked English headwords with 13 letters (nearest by frequency rank).

electromagnet#72,271dimensionally#72,239groundskeeper#72,363combinatorics#72,195

Source: Wiktionary (via kaikki.org) Structured Wiktionary extract

Source: FrequencyWords open word-frequency list