Etymology
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shellfish (n.)

also shell-fish, Old English scylfiscas (plural); see shell (n.) + fish (n.).

updated on September 21, 2013

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Definitions of shellfish from WordNet

shellfish (n.)
meat of edible aquatic invertebrate with a shell (especially a mollusk or crustacean);
shellfish (n.)
invertebrate having a soft unsegmented body usually enclosed in a shell;
Synonyms: mollusk / mollusc
From wordnet.princeton.edu, not affiliated with etymonline.