• (n.) Any one of a group of maioid crabs remarkable for the length of their legs; -- called also spider crab.
Mac'ro·pod noun [ Macro- + -pod .] (Zoology) Any one of a group of maioid crabs remarkable for the length of their legs; -- called also spider crab . 
macropod Long-footed; a long-footed animal, e.g. a spider-crab.