plural noun
Os·​tra·​co·​da | \ ˌästrəˈkōdə, äˈstrakədə\

Definition of Ostracoda

: a subclass of crustacea comprising small active mostly freshwater forms having the body enclosed in a bivalve shell composed of right and left valves, the body segmentation obscured, the abdomen rudimentary, and only seven pairs of appendages

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!

Other Words from Ostracoda

ostracodan \ -​dᵊn \ adjective
ostracodous \ -​dəs \ adjective

History and Etymology for Ostracoda

New Latin, from Greek ostrakōdēs testaceous, from ostrakon potsherd, shell

Keep scrolling for more

Comments on Ostracoda

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


to fake an opponent out of position

Get Word of the Day daily email!

Test Your Vocabulary

Where in the World? A Quiz

  • peter bruegel tower of babel painting
  • What language does pajama come from?
Spell It

Can you spell these 10 commonly misspelled words?


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!