rock crab

noun
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.

Origin:
1830–40, Americanism

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Example sentences
Mottled sea stars and graceful decorator crabs were common, as was the red rock crab.
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