# sea urchin

> English word · Noun · IPA /ˈsi ˌɝtʃɪ̈n/

## Definitions
1. Any 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.

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/sea-urchin