Soft unsegmented marine worms that have a threadlike proboscis and the ability to stretch and contract.  Synonyms: nemertean, nemertine, proboscis worm.
 
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Words linked to "Ribbon worm" :   Nemertea, nemertine, Nemertina, proboscis worm, phylum Nemertea, worm, phylum Nemertina  | 
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