Hypertext Webster Gateway: "shellfish"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Shellfish \Shell"fish`\, n. (Zo["o]l.)
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.
From WordNet (r) 1.7 (wn)
shellfish
n 1: meat of edible aquatic invertebrate with a shell (especially
a mollusk or crustacean)
2: invertebrate having a soft unsegmented body usually enclosed
in a shell [syn: {mollusk}, {mollusc}]
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