plural noun
My·​zo·​sto·​mar·​ia | \ ˌmīzəstəˈma(a)rēə\

Definition of Myzostomaria

: a class or other division of aberrant annelid worms that are probably related to the polychaetes, are parasites of echinoderms, have the form as an adult of an unsegmented disk with ventrally located parapodia, adhesive suckers, distinctive marginal cirri, a coelom obscured by connective tissue, no vascular system, and a single pair of nephridia opening into the posterior intestine, develop indirectly, and have a typical trochophore

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 Myzostomaria

New Latin, from Myzostomum, type genus (from myzo- + -stomum) + -aria

Keep scrolling for more

Comments on Myzostomaria

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


authorized for issue (as a bond)

Get Word of the Day daily email!

Test Your Vocabulary

The Exceptions Quiz III

  • one green toy robot amidst many red toy robots
  • Which of these words does not mean "nonsense"?
Name That Thing

Test your visual vocabulary with our 10-question challenge!


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

Love words? Need even more definitions?

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