Polychaeta

plural noun

Poly·​chae·​ta
: a class of Annelida or in former classifications an order of Chaetopoda that comprises chiefly marine annelid worms usually having paired setate appendages on most segments, a differentiated head with eyes, tactile processes and bristles, and chitinous jaws and being distinguished from the related oligochaete worms by possession of separate sexes and by a complex life history with a free-swimming trochophore larva see errantia , sedentaria

Word History

Etymology

New Latin, from Greek polychaitēs with much hair, from poly- much (from polys much, many) + chaitē long flowing hair

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 Polychaeta

Cite this Entry

“Polychaeta.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/Polychaeta. Accessed 22 Jul. 2024.

Love words? Need even more definitions?

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