cissoid
"cissoid" is a 7-letter English headword indexed on PlainSpell.
The verdict
“cissoid” is uncommon English (outside the top frequency list), classed as a noun. The kind of spelling people second-guess.
- Unranked
- below top-frequency English
- 7
- letters
According to Wiktionary data (CC BY-SA, analyzed September 3, 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...
Corpus desk
Index EN-cissoid · cissoid · English
cissoid · unranked · 0 variants · 0 confusables
- FREQ-UNRANKED Unranked
- LEN-LONG 7 letters
- VOW-3 3 vowels
- CONFUS-0 No pairs
- VAR-0 0 variants
- BOOK-THIN "C" 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 | cissoid |
| Language | English |
| Part of speech | Noun |
| Letters | 7 |
| Misspellings tracked | 0 |
| Confusable pairs | 0 |
| Source | Wiktionary (kaikki.org) |
Long-tail rank of “cissoid” in English
Rare enough to double-check
cissoid is uncommon English outside the top frequency list, classed as anoun. Rarity is why readers land here mid-draft. Gloss: "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.
Recorded use
Wiktionary exampleThese source excerpts show how cissoid appears in context. They illustrate usage; the definition above remains the entry’s reference meaning.
The cissoid of a circle and a line is a conchoid
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.