nemertean

noun

ne·​mer·​te·​an ni-ˈmər-tē-ən 

: any of a phylum (Nemertea synonym 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

nemertine

ˈne-mər-ˌtīn 

adjective or noun

Word History

Etymology

ultimately from Greek Nēmertēs Nemertes, one of the Nereids

First Known Use

1861, in the meaning defined above