1. [countable] a sea animal with a hard shell, five legs on each side, and two large ↑claws ⇨ crustacean 2. [uncountable] the flesh of this animal that you can cook and eat: crab meat dressed crab (=prepared for eating) 3. crabs [plural] informal a medical condition in which a type of ↑louse (=insect) is in the hair around sexual organs 4. [singular] American English informal someone who becomes annoyed easily about unimportant things
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crab A crab has a hard shell and eyes on stalks on its head.