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English definition of “shellfish”

shellfish

noun [C/U]    /ˈʃel·fɪʃ/ (plural shellfish)
an animal that lives in water and has a shell: [C] Lobsters, crabs, shrimp, mussels, and oysters are all shellfish commonly eaten as food.
(Definition of shellfish noun from the Cambridge Academic Content Dictionary © Cambridge University Press)
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