"crustacean" in the noun sense
1. crustacean
any mainly aquatic arthropod usually having a segmented body and chitinous exoskeleton
"crustacean" in the adjective sense
1. crustaceous, crustacean
of or belonging to the class Crustacea
Source: WordNet® (An amazing lexical database of English)
Princeton University "About WordNet®."
WordNet®. Princeton University. 2010.
View WordNet® License