blue crab

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun An edible, bluish swimming crab (Callinectes sapidus) of coastal waters of the western Atlantic Ocean and the Gulf of Mexico.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun bluish edible crab of Atlantic and Gulf Coasts of North America
• noun Atlantic crab; most common source of fresh crabmeat