shellfish

[shel-fish]
noun, plural (especially collectively) shellfish (especially referring to two or more kinds or species) shellfishes.
an aquatic animal having a shell, as the oyster and other mollusks and the lobster and other crustaceans.

Origin:
before 900; Middle English; Old English scilfisc. See shell, fish

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World English Dictionary
shellfish (ˈʃɛlˌfɪʃ)
 
n , pl -fish, -fishes
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

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Example sentences
Staging posts along the flyway, used by migrating birds for millennia, are
  being over-exploited for shellfish.
Similar efforts are under way with plant toxins, and with poisons extracted
  from shellfish and puffer fish.
Allergies to peanuts, tree nuts, and shellfish tend to be lifelong.
Fish generally contains less cholesterol than other meats, but some shellfish
  are high in cholesterol.
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