Medical Definition of Arthropoda
: a phylum of invertebrate animals (as insects, arachnids, and crustaceans) having a segmented body and jointed appendages, usually a shell of chitin molted at intervals, and an anterior brain dorsal to the digestive tract and connected with a ventral chain of ganglia
arthropod\ˈär-thrə-ˌpäd\play adjective or noun
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