sponge crab

noun

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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