Definition of sponge crab
1 : a female crab bearing an egg mass
2 : any of several crabs commonly found in association with sponges: such as a (1) : grass crab (2) : a crab of the group Dromiacea that decorates its back with sponges or ascidians b : any of several hermit crabs of the Pacific coast of North America that excavate their homes in a living sponge (Suberites latus)
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