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shellfish

[shel-fish] /ˈʃɛlˌfɪʃ/
noun, plural (especially collectively) shellfish (especially referring to two or more kinds or species) shellfishes.
1.
an aquatic animal having a shell, as the oyster and other mollusks and the lobster and other crustaceans.
Origin
900
before 900; Middle English; Old English scilfisc. See shell, fish
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for shellfishes

shellfish

/ˈʃɛlˌfɪʃ/
noun (pl) -fish, -fishes
1.
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
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin and History for shellfishes

shellfish

n.

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

Online Etymology Dictionary, © 2010 Douglas Harper
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20
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