shellfish
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shellfish
any aquatic invertebrate having a shell or shell-like carapace, esp such an animal used as human food. Examples are crustaceans such as crabs and lobsters and molluscs such as oysters
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005
shellfish
[′shel‚fish] (invertebrate zoology)
An aquatic invertebrate, such as a mollusk or crustacean, that has a shell or exoskeleton.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.