river crab

noun

Definition of river crab

  1. 1 :  a freshwater crab of the family Potamonidae; especially :  a common crab (Potamon fluviatile) of flowing waters of southern Europe

  2. 2 :  a Central American grapsid crab (Platychirograpsus typicus) living in burrows along riverbanks

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to cast off or become cast off

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