- [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 (= towards the side) on land. 蟹；螃蟹 
- [uncountable]
meat from a crab, used for food 蟹肉 dressed crab 经加工的螃蟹
- crabs(informal)
the condition caused by having lice (called crab lice) in the hair around the genitals 阴虱病
Word OriginOld 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.