decapod (n.)

1819, "ten-legged animal, type of crustacean having ten legs" (crabs, lobsters, shrimp), from French décapode (1806), from Modern Latin Decapoda (animalia), from Greek dekapoda, neuter plural of dekapous "ten-footed" (see ten + foot (n.)). From 1885 in reference to a type of locomotive with ten driving-wheels.