Definition of river crab
1 : a freshwater crab of the family Potamonidae; especially : a common crab (Potamon fluviatile) of flowing waters of southern Europe
2 : a Central American grapsid crab (Platychirograpsus typicus) living in burrows along riverbanks
Start your free trial today and get unlimited access to America's largest dictionary, with:
- More than 250,000 words that aren't in our free dictionary
- Expanded definitions, etymologies, and usage notes
- Advanced search features
- Ad free!
Seen and Heard
What made you want to look up river crab? Please tell us where you read or heard it (including the quote, if possible).