n. 1 any crustacean of the chiefly marine order Decapoda, characterized by five pairs of walking legs, e.g. shrimps, crabs, and lobsters. 2 any of various molluscs of the class Cephalopoda, having ten tentacles, e.g. squids and cuttlefish. decapodan adj.
[ F décapode f. Gk deka ten + pous podos foot ]