any soft flattened ribbon-like marine worm of the phylum (or class) Nemertea (or Nemertina), having an eversible threadlike proboscis
adjective
2.
of, relating to, or belonging to the Nemertea
Word origin
C19: via New Latin from Greek Nēmertēs a Nereid1
nemertean in American English
(niˈmɜrtiən; nəˈmɜrtiən)
noun
1.
any of a phylum (Nemertea) of usually very elongate, unsegmented marine worms with no body cavity and with a protrusile proboscis, living mostly in coastal mud or sand; ribbon worm
adjective
2.
of or belonging to these worms
: also ˈnemertine (ˈnɛmərtɪn; ˈnɛmərˌtaɪn) or ˌnemerˈtinean (ˈnɛmərˈtɪniən)
Word origin
< ModL Nemertea < Gr Nēmertēs, name of a sea nymph < nēmertēs, unerring