crab
crab [crab crabs crabbed crabbing] BrE [kræb] NAmE [kræb] noun 
1. countable a sea creature with a hard shell, eight legs and two ↑pincers (= curved and pointed arms for catching and holding things). Crabs move sideways on land.
see also ↑hermit crab
2. uncountable meat from a crab, used for food
•dressed crab
3. crabs (informal)the condition caused by having ↑lice (called crab lice) in the hair around the ↑genitals
Word Origin:
Old English crabba, of Germanic origin; related to Dutch krabbe, and more distantly to Dutch kreeft and German Krebs; also to crab in the sense to grumble.
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