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Definition of crab
- 2 (also crab louse) a louse that infests human body hair, especially in the genital region, causing extreme irritation. Also called pubic louse.
- Phthirus pubis, family Pediculidae, order Anoplura
verb (crabs, crabbing, crabbed)
Pronunciation: /-ˌlīk/adjective & adverb
Old English crabba, of Germanic origin; related to Dutch krabbe, and more distantly to Dutch kreeft and German Krebs; also to crab3