1835 as a type of crustacean having 10 legs, from Fr. décapode (1806), from Mod.L. Decapoda (animalia), from Gk. dekapoda, neut. pl. of dekapous "ten-footed." From 1888 as a type of locomotive.
Any of various crustaceans of the order Decapoda, characteristically having ten legs, each joined to a segment of the thorax. Crabs, hermit crabs, lobsters, and shrimp are decapods.
A cephalopod mollusk, such as a squid or cuttlefish, having ten armlike tentacles.