noun
1. : a female crab bearing an egg mass
2. : any of several crabs commonly found in association with sponges: 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 No. America that excavate their homes in a living sponge ( Suberites latus )