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nemertine[ noun ]soft unsegmented marine worms that have a threadlike proboscis and the ability to stretch and contract<noun.animal> 
nemertine \nemertine\ n.
Any of an order ({Nemertina}) of soft unsegmented marine
worms having an eversible threadlike proboscis and the
ability to stretch and contract.
Syn: ribbon worm, nemertean, proboscis worm.
[WordNet 1.5]