meat of edible aquatic invertebrate with a shell (especially a mollusk or crustacean)
source: WordNet 3.0
invertebrate having a soft unsegmented body usually enclosed in a shell
source: WordNet 3.0
Any aquatic animal whose external covering consists of a shell, either testaceous, as in oysters, clams, and other mollusks, or crustaceous, as in lobsters and crabs.
