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Definition of crustacean noun from the Oxford Advanced American Dictionary

 

crustacean

 noun
noun
NAmE//krʌˈsteɪʃn//
 
(technology)
 
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any creature with a soft body that is divided into sections, and a hard outer shell. Most crustaceans live in water. crab, lobster, and shrimp are all crustaceans. compare shellfish
See the Oxford Advanced Learner's Dictionary entry: crustacean