egg case
C1-C2Technical/Scientific
Definition
Meaning
A protective capsule or structure, typically tough and leathery, that contains the eggs of certain animals.
In a business or tech context, can be used metaphorically to describe a protected or encapsulated unit, module, or component.
Linguistics
Semantic Notes
Primarily a biological term; metaphorical use is very rare and context-dependent.
Dialectal Variation
British vs American Usage
Differences
No significant lexical difference. In scientific texts, the British spelling 'case' is identical to the American spelling.
Connotations
Neutral and technical in both varieties.
Frequency
Equally low-frequency in both varieties, confined to specific scientific or educational contexts.
Vocabulary
Collocations
Grammar
Valency Patterns
[to find/discover/examine] an egg caseegg case [of/from/laid by] a shark/skateVocabulary
Synonyms
Strong
Neutral
Weak
Vocabulary
Antonyms
Phrases
Idioms & Phrases
- “[No established idioms for this specific compound]”
Usage
Context Usage
Business
Virtually unused. A forced metaphor might be 'the project is in its egg case phase' meaning it is protected and undeveloped.
Academic
Used in marine biology, entomology, and zoology papers to describe the reproductive structures of certain species.
Everyday
Used by beachcombers, naturalists, or in educational settings (e.g., museums, aquariums, documentaries).
Technical
Standard term in relevant biological fields for the protective capsule surrounding a clutch of eggs.
Examples
By Part of Speech
verb
British English
- The whelk egg cases can be seen washed up on the strandline.
- The shark egg-cased its embryos for protection.
American English
- The skate leaves its egg case anchored to seaweed.
- Researchers observed how the species egg-cases its young.
adverb
British English
- [No standard adverbial use]
American English
- [No standard adverbial use]
adjective
British English
- The egg-case material was surprisingly tough.
- They studied the egg-case morphology.
American English
- The egg-case structure varies by species.
- An egg-case fragment was found on the beach.
Examples
By CEFR Level
- We found an egg case on the beach.
- The children collected empty egg cases from the shoreline.
- Marine biologists can identify the species of shark by the shape and size of its egg case.
- The spiral, parchment-like egg case of the whelk is a common sight along the North Atlantic coast.
Learning
Memory Aids
Mnemonic
Think of a 'case' for your phone. An 'egg case' is like a tough, natural phone case, but for eggs from creatures like sharks and whelks.
Conceptual Metaphor
PROTECTION IS A CONTAINER; DEVELOPMENT IS ENCAPSULATION.
Watch out
Common Pitfalls
Translation Traps (for Russian speakers)
- Do not translate as 'яичный кейс' or 'яичный случай'. 'Case' here means 'оболочка', 'футляр', 'капсула'. Correct translation: 'яйцевая капсула', 'кокон с яйцами'.
Common Mistakes
- Using 'egg shell' for aquatic animals (shell is calcareous and brittle, a case is often leathery).
- Spelling as one word: 'eggcase' (standard is two words).
Practice
Quiz
What is a 'mermaid's purse' a colloquial name for?
FAQ
Frequently Asked Questions
It is standardly written as two separate words: 'egg case'.
Sharks, skates, rays, whelks, and some insects like cockroaches (where it's called an ootheca).
No, it is not used for bird eggs. For a chicken egg, you would say 'eggshell'.
It is a low-frequency, specialized term. Most people encounter it only in specific contexts like marine biology, beachcombing, or nature documentaries.