A marine crustacean with a broad, flattened shell, a small abdomen tucked under the thorax, and pincers. The crab scuttled across the sandy beach, leaving tiny tracks behind.
A machine for hoisting heavy loads, typically consisting of a drum on which a rope or chain winds. The construction site used a crab to lift the steel beams into place.
A type of apple that is small and sour, often used for making jelly. We picked a basket full of crab apples to make jelly for the winter.
A person who is irritable or grumpy. He's such a crab in the mornings before he has his coffee.
The flesh of a crab used as food, regarded as a mass noun. We had fresh crab for dinner last night.
(slang) A parasitic louse (Phthirus pubis) that infests human pubic hair; a pubic louse. The doctor explained that the itching was caused by a crab, a type of pubic louse.