crab Definition

crab¹
noun

1. Any of a species of mostly marine crustaceans, with a hard flattened shell and five pairs of jointed legs, the front pair being developed into pincers.
2a. Another name for the crab louse;
2b. Infestation by this.

Form: crabs
3. astron.astrol.
Cancer.
Form: Crab

Idiom: catch a crab

In rowing: to sink the oar too deeply or to miss the water completely, so that the rower falls backwards.

Etymology: Anglo-Saxon crabba.

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crab²
noun

1. Short for crab apple.
2. A grumpy or irritable person.

Etymology: 15c.