A crab is a water-dwelling creature. A related common meaning is crab meat.

Look up crab in Wiktionary, the free dictionary.

Crab or crabs may also refer to:

• Anomura, an infraorder containing hermit crabs, king crabs, and other animals, a sister group to the true crabs
• Horseshoe crab, a chelicerate that lays its eggs on beaches and is utilized by the biomedical industry

• Cancer (astrology), a sign in the zodiac
• Cancer (Chinese astronomy)

• Cancer (constellation), a stellar constellation
• Crab Nebula, the supernova remnant found in the constellation Taurus
  • Crab Pulsar, the central star in the Crab Nebula
• Crab (unit), photometrical unit of X-ray astronomy
• CRAB, an abbreviation for the symptoms of multiple myeloma
• "Crabs", a colloquial term for Pediculosis pubis
  • Crab louse (Pthirus pubis), a type of parasitic louse
• Carbapenem-resistant Acinetobacter baumannii (CRAB), a type of bacteria

• Crab (cipher), an encryption algorithm based on MD5
• Crab landing, a method of landing a fixed-wing aircraft in a crosswind

• Crab, Virginia, an unincorporated community
• Crab Brook, a tributary of Stony Brook in central New Jersey
• Crab Creek, in the U.S. state of Washington
• Crab Creek (Little River), in North and South Carolina
• Crab Run (Mahanoy Creek), Pennsylvania
• Crab Run (West Virginia), a stream
• Crab Island (disambiguation)
• Crab Cay, Colombia, a small island in the Caribbean Sea

• Crab (horse) (1722–1750), a British Thoroughbred racehorse
• Basket Rimini Crabs, an Italian professional basketball team based in Rimini, Emilia-Romagna
• Crab (posture) used in gymnastics, breakdancing, yoga
• Crab or catch a crab, a rowing error

• Sherman Crab, a British World War II mine-clearing tank
• Panhard CRAB, a French armoured combat vehicle
• Roger Crab (1621–1680), English soldier, haberdasher, herbal doctor and writer
• An athletic move akin to the float in breakdancing

• Crab apples, species of the genus Malus other than the table apple Malus domestica
• All pages with titles beginning with Crab
• Krab (disambiguation)

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