Definition of red crab in English:

red crab

noun

  • Any of various crabs of a red colour; especially the edible Cancer productus and the pelagic Pleuroncodes planipes of the Pacific coast of North America, the deep-water Chaceon quinquedens of the Atlantic, and the terrestrial Gecarcoidea natalis of Christmas Island.

Origin

Late 17th century; earliest use found in John Ray (1627–1705), naturalist and theologian.