Akademik

blue crab
noun
1. Atlantic crab; most common source of fresh crabmeat
Hypernyms: ↑crab, ↑crabmeat
Part Holonyms: ↑Callinectes sapidus
2. bluish edible crab of Atlantic and Gulf Coasts of North America
Syn: ↑Callinectes sapidus
Hypernyms: ↑swimming crab
Member Holonyms: ↑Callinectes, ↑genus Callinectes

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noun
1. : any of several largely blue swimming crabs of the genus Callinectes of the Atlantic and Gulf coasts of the United States; especially : a crab (C. sapidus) that is particulary common from Texas to Delaware and is used extensively as food, providing the soft-shelled crabs of the markets
2. Australia : an important edible crab (Portunus pelagicus)

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an edible crab, Callinectes sapidus, having a dark green body and bluish legs, found along the Atlantic and Gulf coasts of North America.
[1880-85, Amer.]

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blue crab,
the most common edible crab of eastern North America.

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n. a large edible swimming crab of the Atlantic coast of North America. Callinectes sapidus, family Portunidae

Useful english dictionary. 2012.