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Definition of NEMERTEAN
: any of a phylum (Nemertea syn. Rhynchocoela) of often vividly colored usually long dorsoventrally flattened marine worms that typically burrow in the mud or sand along seacoasts —called also ribbon worm
— nem·er·tine\ˈne-mər-ˌtīn\adjective or noun
Origin of NEMERTEAN
ultimately from Greek Nēmertēs Nemertes, one of the Nereids