Definition of crayfish noun from the Oxford Advanced American Dictionary

 

crayfish

 noun
noun
NAmE//ˈkreɪfɪʃ//
 
(also crawfish)[countable, uncountable](pl. crayfish, crawfish)
 
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an animal like a small lobster, that lives in rivers and lakes and can be eaten, or one like a large lobster, that lives in the ocean and can be eaten
See the Oxford Advanced Learner's Dictionary entry: crayfish