Wordnet 3.0
NOUN (1)
1.
any mainly aquatic arthropod usually having a segmented body and chitinous exoskeleton;
ADJECTIVE (1)
1.
of or belonging to the class Crustacea;
[syn: crustaceous, crustacean]
The Collaborative International Dictionary of English v.0.48:
Crustacean \Crus*ta"cean\ (kr?s-t?"shan; 97), a. (Zool.)
Of or pertaining to the Crustacea; crustaceous. -- n. An
animal belonging to the class Crustacea.
[1913 Webster]
WordNet (r) 3.0 (2006):
crustacean
adj 1: of or belonging to the class Crustacea [syn:
crustaceous, crustacean]
n 1: any mainly aquatic arthropod usually having a segmented
body and chitinous exoskeleton