meat of edible aquatic invertebrate with a shell (especially a mollusk or crustacean)
"The chef warned that he could not serve anyone who was allergic to shellfish because the seafood platter included mussels and shrimp."
A fisheries and colloquial term for an aquatic invertebrate having an inner or outer shell, such as a mollusc or crustacean, especially when edible.
"The chef warned us that the oysters on the menu are fresh shellfish caught from the bay this morning."