Definition of shellfish noun from the Oxford Advanced American Dictionary

 

shellfish

 noun
noun
NAmE//ˈʃɛlfɪʃ//
 
(pl. shellfish)
 
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a creature with a shell, that lives in water, especially one of the types that can be eaten. oysters and crabs are shellfish. compare crustacean, mollusk
See the Oxford Advanced Learner's Dictionary entry: shellfish