sea urchin
/ˈsi ˌɝtʃɪ̈n/
"sea-urchin" is a 9-letter English headword indexed on PlainSpell.
The verdict
“sea urchin” is uncommon English (outside the top frequency list), classed as a noun. The kind of spelling people second-guess.
- Unranked
- below top-frequency English
- 10
- letters
According to Wiktionary data (CC BY-SA, analyzed May 6, 2026) - Any of many marine echinoderms, of the class Echinoidea, commonly found in shallow water, having a complex chewing structure named Aristotle's lantern.
| Property | Value |
|---|---|
| Headword | sea urchin |
| Language | English |
| Part of speech | Noun |
| IPA | /ˈsi ˌɝtʃɪ̈n/ |
| Letters | 10 |
| Misspellings tracked | 0 |
| Confusable pairs | 0 |
| Source | Wiktionary (kaikki.org) |
Where “sea urchin” sits in English frequency
Rare enough to double-check
sea urchin is uncommon English outside the top frequency list, classed as anoun, transcribed /ˈsi ˌɝtʃɪ̈n/. Rarity is why readers land here mid-draft. Gloss: "Any of many marine echinoderms, of the class Echinoidea, commonly found in shallow water, having a complex chewing structure named Aristotle's lantern.".
Our edit-distance generator produced no likely misspellings for sea urchin, a sign its spelling follows regular English conventions. Our confusable-pair dataset has no match for it, which usually means its spelling is distinct enough that readers don't reach for a similar-looking word instead.
Etymologically, the entry records: From sea + urchin (“hedgehog”), reflecting a similarity in appearance to a hedgehog. The correct English form is sea urchin, spelled S-E-A- -U-R-C-H-I-N.
Definition
- 1Any of many marine echinoderms, of the class Echinoidea, commonly found in shallow water, having a complex chewing structure named Aristotle's lantern.
Etymology
From sea + urchin (“hedgehog”), reflecting a similarity in appearance to a hedgehog.
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 “sea urchin”
The practical upshot for anyone who landed here from a spell-check.
- The one correct English spelling is S-E-A- -U-R-C-H-I-N - every other letter order is a misspelling in standard orthography.
- Say it as /ˈsi ˌɝtʃɪ̈n/ (IPA); tap the speaker on the pronunciation badge to hear it where audio exists.
- 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.