any of several crabs that live along rocky beaches, especially those of the genus Cancer, as C. irroratus, of the eastern coast of North America, having the rear legs modified for running.
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Origin of rock crab
An Americanism dating back to 1830–40
Words nearby rock crab
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020
Example sentences from the Web for rock crab
In the little hollows between rocks a rock-crab or a green-crab may be found on guard.