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• XIPHOSURUS POLYPHEMUS (noun) The noun XIPHOSURUS POLYPHEMUS has 1 sense: 1. large marine arthropod of the Atlantic coast of North America having a domed carapace that is shaped like a horseshoe and a stiff pointed tail; a living fossil related to the wood louse Familiarity information: XIPHOSURUS POLYPHEMUS used as a noun is very rare.
