plural noun

: 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

Word History


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

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!

Dictionary Entries Near Myzostomaria

Cite this Entry

“Myzostomaria.” Dictionary, Merriam-Webster, Accessed 24 Jun. 2024.

Love words? Need even more definitions?

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