mollusk
C1Formal, Technical, Scientific
Definition
Meaning
An invertebrate animal with a soft body, often protected by a hard shell; a member of the phylum Mollusca (e.g., snails, clams, octopuses).
Sometimes used metaphorically to describe a person perceived as soft-bodied, weak, or lacking resolve.
Linguistics
Semantic Notes
Primarily a biological/zoological term. The metaphorical use is rare and often pejorative.
Dialectal Variation
British vs American Usage
Differences
The British English spelling is 'mollusc'. The American English spelling is 'mollusk'.
Connotations
Identical in technical contexts. The metaphorical use is equally rare in both varieties.
Frequency
Slightly more common in American English due to the spelling aligning with the scientific Latin root 'Mollusca'.
Vocabulary
Collocations
Grammar
Valency Patterns
[The/This/That] + mollusk + verb (e.g., burrows, feeds)[Adjective] + mollusk + [prepositional phrase] (e.g., A bivalve mollusk from the estuary)to study/collect/identify + mollusksVocabulary
Synonyms
Neutral
Weak
Vocabulary
Antonyms
Usage
Context Usage
Business
Virtually unused, except potentially in specific industries like seafood export.
Academic
Common in biology, zoology, paleontology, and marine science texts.
Everyday
Used by beachcombers, in nature documentaries, or when discussing seafood.
Technical
The standard term in taxonomy and marine biology for members of the phylum Mollusca.
Examples
By Part of Speech
adjective
British English
- The molluscan fauna is diverse.
- Molluscan anatomy was studied.
American English
- The molluscan fauna is diverse.
- Molluscan anatomy was studied.
Examples
By CEFR Level
- We found a mollusk on the beach.
- The octopus is a very intelligent mollusk.
- The biology class went to the shore to collect different mollusk specimens.
- The fossil record indicates that this ancient mollusk possessed a uniquely coiled shell morphology.
Learning
Memory Aids
Mnemonic
Imagine a MOLLY fish USKing (asking) a snail for its hard shell because mollusks are soft inside.
Conceptual Metaphor
SOFTNESS IS VULNERABILITY (in rare metaphorical use: 'He's a political mollusk').
Watch out
Common Pitfalls
Translation Traps (for Russian speakers)
- Do not confuse with 'моллюск' (the direct cognate) which has the same meaning. The spelling difference (UK 'mollusc', US 'mollusk') is key.
Common Mistakes
- Misspelling as 'mollusc' in American English or 'mollusk' in British English.
- Using it as a general term for all shellfish (it excludes crustaceans like crabs and shrimp).
Practice
Quiz
Which of the following is NOT a mollusk?
FAQ
Frequently Asked Questions
'Shellfish' is a culinary and informal term that includes crustaceans (e.g., shrimp, crab) which are not mollusks. 'Mollusk' is a precise scientific term for a specific phylum of soft-bodied invertebrates, many of which have shells.
Yes. Although it lacks an external shell, the octopus belongs to the class Cephalopoda within the phylum Mollusca. Its anatomy and evolutionary history align it with snails and clams.
Both derive from the Latin 'molluscus'. 'Mollusc' follows French-influenced British spelling conventions. 'Mollusk' is the American spelling, chosen to better reflect the Latin root and pronunciation.
Rarely, but yes. Metaphorically, calling someone a 'mollusk' implies they are spineless, soft, or lacking in courage, much like the animal's physical body.