A crustacean with ten feet or legs, as a crab; one of the Decapoda. Also used adjectively.
- A crustacean of the order Decapoda, such as a crab, lobster, or shrimp, characteristically having ten legs, each joined to a segment of the thorax.
- A cephalopod mollusk, such as a squid or cuttlefish, having ten armlike tentacles.
- Of or relating to the Decapoda or a decapod.