Crustacean Definition
 krŭ-stāshən 
  crustaceans
  
    noun
  
 
    crustaceans
  
Any of a subphylum (Crustacea) of arthropods, including shrimps, crabs, barnacles, and lobsters, that usually live in the water and breathe through gills: they have a hard outer shell and jointed appendages.
 Webster's New World 
Other Word Forms of Crustacean
Noun
Singular:
 crustaceanPlural:
 crustacea, crustaceansOrigin of Crustacean
-  
From New Latin Crūstācea class name neuter pl. of crūstāceus hard-shelled from Latin crusta shell kreus- in Indo-European roots
From American Heritage Dictionary of the English Language, 5th Edition
 
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