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Definition of BLUE CRAB
: a large bluish-green edible crab (Callinectes sapidus of the family Portunidae) of the Atlantic and Gulf coasts
Illustration of BLUE CRAB
First Known Use of BLUE CRAB
Blue crab (Callinectes sapidus)—John H. GerardThe National Audubon Society Collection/Photo Researchers
Any member of a genus (Callinectes) of decapods, particularly C. sapidus and C. hastatus, common edible crabs of the western Atlantic coast prized as delicacies. Their usual habitats are muddy shores, bays, and estuaries. The blue crab shell, greenish on top and dingy white below, is about 3 in. (15–18 cm) long. The legs are bluish. The chelae, or pincers, are large and somewhat unequal in size, and the fifth pair of legs is flattened for swimming. Blue crabs are scavengers.