Merriam-Webster Logo
SINCE 1828
Menu
dictionary thesaurus

Protonemertini

plural noun
Pro·​to·​nemertini | \ ¦prōt(ˌ)ō+\

Definition of Protonemertini

in some classifications
: an order of unarmed nemertine worms in which the brain and lateral nerves lie outside the musculature

Love words?

You must — there are over 200,000 words in our free online dictionary, but you are looking for one that’s only in the Merriam-Webster Unabridged Dictionary.

Start your free trial today and get unlimited access to America's largest dictionary, with:

  • More than 250,000 words that aren't in our free dictionary
  • Expanded definitions, etymologies, and usage notes
  • Advanced search features
  • Ad free!

History and Etymology for Protonemertini

New Latin, from prot- + Nemertini

Keep scrolling for more

Learn More about Protonemertini

Statistics for Protonemertini

Look-up Popularity

Comments on Protonemertini

What made you want to look up Protonemertini? Please tell us where you read or heard it (including the quote, if possible).

Show Comments  Hide Comments 

WORD OF THE DAY

excursion

Listen to the pronounciation of excursion

a usually brief trip or an expedition

Get Word of the Day daily email!

Test Your Vocabulary

Summer 2019 Words of the Day Quiz

  • a-bowl-of-peach-sorbet-with-cut-peaches-next-to-it
  • Which is a synonym of desideratum?
Name That Thing

Test your visual vocabulary with our 10-question challenge!

TAKE THE QUIZ
Dictionary Devil

Test Your Knowledge - and learn some interesting things along the way.

TAKE THE QUIZ
Love words? Need even more definitions?

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

Words at Play
Ask the Editors
Word Games