sea urchin: meaning, definition, pronunciation and examples
C1formal, semi-formal, informal, technical (marine biology)
Quick answer
What does “sea urchin” mean?
A small, round marine animal with a hard, spiny shell.
Audio
Pronunciation
Definition
Meaning and Definition
A small, round marine animal with a hard, spiny shell.
Any echinoderm of the class Echinoidea, characterized by a globular or flattened test (shell) covered with movable spines, found on the seabed in most marine habitats. The gonads (roe) of some species are considered a delicacy in certain cuisines.
Dialectal Variation
British vs American Usage
Differences
No significant lexical or semantic differences. Spelling is identical.
Connotations
Identical; primarily associated with marine life, beach hazards, and, in culinary contexts, sushi (uni).
Frequency
Similar frequency in both varieties, slightly higher in coastal regions or areas with strong seafood/sushi culture.
Grammar
How to Use “sea urchin” in a Sentence
The [adjective] sea urchin [verb, e.g., lives, crawls].[Verb, e.g., Watch out for, Harvest] sea urchins [prepositional phrase, e.g., on the reef].Vocabulary
Collocations
Examples
Examples of “sea urchin” in a Sentence
verb
British English
- The policy aims to sea-urchin-proof the popular bathing cove. (rare, non-standard)
American English
- The reef was completely sea-urchined, making it unsafe for swimmers. (rare, non-standard)
adjective
British English
- The sea-urchin spines were carefully removed. (compound adjective)
American English
- We studied the sea-urchin population dynamics. (compound adjective)
Usage
Meaning in Context
Business
Used in contexts of seafood export, aquaculture, or restaurant supply chains (e.g., 'The price of premium sea urchin roe has doubled this season.').
Academic
Used in marine biology, ecology, and environmental science papers (e.g., 'Sea urchin barrens significantly impact kelp forest biodiversity.').
Everyday
Used in conversations about the beach, marine life, or food (e.g., 'Ouch, I think I stepped on a sea urchin!' or 'Have you ever tried sea urchin sushi?').
Technical
Specific to taxonomy (Echinoidea), anatomy (test, Aristotle's lantern), and fisheries science (e.g., 'Tripneustes gratilla shows a rapid gonad development cycle.').
Watch out
Common Mistakes When Using “sea urchin”
- Misspelling as 'sea urching' or 'sea urchins' (plural 's' is often forgotten).
- Using as a countable noun without plural 's' when referring to multiple (e.g., 'I saw three sea urchin' is incorrect).
FAQ
Frequently Asked Questions
Their spines can cause painful puncture wounds if stepped on, and some species have mildly venomous spines, but they are not aggressive and do not attack humans.
The edible part is the gonads, often referred to as 'roe' or 'coral'. It is a delicacy in Japanese (uni), Mediterranean, and Chilean cuisines.
It is a compound noun written as two separate words: 'sea urchin'. The plural is 'sea urchins'.
Both are echinoderms, but sand dollars are a type of flattened, burrowing sea urchin. The common 'sea urchin' typically refers to the globular, spiny varieties.
A small, round marine animal with a hard, spiny shell.
Sea urchin is usually formal, semi-formal, informal, technical (marine biology) in register.
Sea urchin: in British English it is pronounced /ˈsiː ˌɜː.tʃɪn/, and in American English it is pronounced /ˈsiː ˌɝː.tʃɪn/. Tap the audio buttons above to hear it.
Learning
Memory Aids
Mnemonic
Imagine a hedgehog (an 'urchin' in old English) that lives in the SEA, but with longer, sharper spines. SEA + URCHIN.
Conceptual Metaphor
A PIN CUSHION / PORCUPINE OF THE SEA (emphasizing its defensive, spiny nature).
Practice
Quiz
What is 'uni' in Japanese cuisine?