Amphipoda amp·hi·poda uncommon noun 1. small flat-bodied semi-terrestrial crustaceans: whale lice; sand-hoppers; skeleton shrimp Synonymsorder Amphipoda Related words Broader terms animal order Parts Malacostraca Part of amphipodOrchestiidaeCaprellaCyamus WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.