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 ]
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 ]