单词	Amphipoda
释义	Amphipoda plural noun Am·​phip·​o·​da amˈfipədə : a large group, usually an order, of malacostracan crustaceans (division Peracarida) comprising the beach fleas and related forms; being mostly of small size with laterally compressed body, four anterior pairs of thoracic limbs directed forward, and three posterior pairs directed backward and upward, the thoracic limbs bearing gills; being usually aquatic in fresh or salt water, and a few (as the whale louse) being parasitic Word History Etymology New Latin, from amphi- + -poda First Known Use 1817, in the meaning defined above
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