ne·mer·te·an 
(nĭ-mûrtē-ən) also nem·er·tine (nĕmər-tīn′)
(nĭ-mûrtē-ən) also nem·er·tine (nĕmər-tīn′)n.
Any of various unsegmented chiefly carnivorous worms of the phylum Nemertea (or Nemertini) that have a long, often brightly colored body with an extensible proboscis and typically live in the sea or in the mud of the intertidal zone. Also called ribbon worm.
[From New Latin Nēmertēs, type genus, from Greek, name of a Nereid.]
ne·merte·an adj.