cissoid
"cissoid" is a 7-letter English headword indexed on PlainSpell.
The verdict
“cissoid” is outside the top-ranked English vocabulary, used as a noun - the kind of word writers most often double-check.
- Unranked
- below top-frequency English
- 7
- letters
According to Wiktionary data (CC BY-SA, analyzed May 6, 2026) - Any of a family of curves defined as the locus of a point, P, on a line from a given fixed point and intersecting two given curves, C₁ and C₂, where the distance along the line from C₁ to P remains...
| Property | Value |
|---|---|
| Headword | cissoid |
| Language | English |
| Part of speech | Noun |
| Letters | 7 |
| Misspellings tracked | 0 |
| Confusable pairs | 0 |
| Source | Wiktionary (kaikki.org) |
Where “cissoid” sits in English frequency
Spelling & Dictionary Insight
The English entry for cissoid is 7 letters long, classified as a noun. It sits outside the most-frequent rank tiers, which is often why uncommon words generate more spelling variants per reader. The dominant gloss from Wiktionary reads: "Any of a family of curves defined as the locus of a point, P, on a line from a given fixed point and intersecting two given curves, C₁ and C₂, where the distance along the line from C₁ to P remains...".
We couldn't generate a plausible misspelling set for cissoid, a straightforward case of a spelling with little room for common typos. Our dataset records no confusable match here, a sign it's visually distinctive enough not to be mixed up with another word.
Etymologically, the entry records: From Ancient Greek κισσός (kissós, “ivy”) + εἶδος (eîdos, “form, image”). The correct English form is cissoid, spelled C-I-S-S-O-I-D.
Definition
- 1Any of a family of curves defined as the locus of a point, P, on a line from a given fixed point and intersecting two given curves, C₁ and C₂, where the distance along the line from C₁ to P remains constant and equal to the distance from P to C₂.
Etymology
From Ancient Greek κισσός (kissós, “ivy”) + εἶδος (eîdos, “form, image”).
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.
Frequently Asked Questions
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Using “cissoid”
The practical upshot for anyone who landed here from a spell-check.
- The one correct English spelling is C-I-S-S-O-I-D - every other letter order is a misspelling in standard orthography.
- Browse more English words and confusable pairs in the same reference. English words
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.