nemertean

1 of 3

noun (1)

ne·​mer·​te·​an ni-ˈmər-tē-ən How to pronounce nemertean (audio)
: 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 adjective or noun

nemertine

2 of 3

adjective

nem·​er·​tine ˈnemə(r)ˌtin How to pronounce nemertine (audio)
-tēn
variants or nemertinean
¦⸗⸗¦tinēən
: of or relating to the Nemertea

nemertine

3 of 3

noun (2)

"
variants or nemertinean
"
plural -s
: a worm of the group Nemertea

Word History

Etymology

Noun (1)

ultimately from Greek Nēmertēs Nemertes, one of the Nereids

Adjective

nemertinean from New Latin Nemertinea + English -an, adjective suffix; nemertine from New Latin Nemertinea, Nemertina, Nemertini

Noun (2)

nemertinean from New Latin Nemertinea + English -an, noun suffix; nemertine from New Latin Nemertinea, Nemertina, Nemertini

First Known Use

Noun (1)

1861, in the meaning defined above

Time Traveler
The first known use of nemertean was in 1861

Browse Nearby Words

Cite this Entry

“Nemertean.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/nemertean. Accessed 23 Jun. 2026.

More from Merriam-Webster on nemertean

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!

More from Merriam-Webster