As a Noun: 1. An animal with a hard outer shell and several pairs of legs, which usually lives in water, such as crayfish and lobsters. English = crustacean. 2. A sea creature that has a hard shell, two large claws, and eight legs. English = lobster. 3. A small shellfish with five pairs of legs which lives in rivers and ponds. It has strong pincers on its front legs which it uses for catching food. English = crayfish. 4. A type of crayfish found in the Moreton Bay area of south west Queensland. English = Moreton Bay bug.