shellfish

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shellfish,

popular name for certain edible mollusks (see MolluscaMollusca
, taxonomic name for the one of the largest phyla of invertebrate animals (Arthropoda is the largest) comprising more than 50,000 living mollusk species and about 35,000 fossil species dating back to the Cambrian period.
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), e.g., oysters, clams, and scallops, and for certain edible crustaceanscrustacean
, primarily aquatic arthropod of the subphylum Crustacea. Most of the 44,000 crustacean species are marine, but there are many freshwater forms. The few groups that inhabit terrestrial areas have not been particularly successful in an evolutionary sense; most require
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, e.g., crabs, lobsters, and shrimps. All are aquatic invertebrates with shells; they are not fish.

shellfish

[′shel‚fish]
(invertebrate zoology)
An aquatic invertebrate, such as a mollusk or crustacean, that has a shell or exoskeleton.

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