plural noun

Definition of Arthrodira

: a group of Devonian fishes forming a subclass of Placodermi or especially formerly an order of Ostracodermi or a separate class and having the forepart of the body protected by bony plates and with an imperfectly ossified internal skeleton — see coccosteidae , dinichthys

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 Arthrodira

arthrodiran \ ¦⸗⸗¦dīrən \ adjective or noun
arthrodire \ ˈ⸗⸗ˌdī(ə)r \ noun, plural -s
arthrodirous \ -​¦dīrəs \ adjective

First Known Use of Arthrodira

1891, in the meaning defined above

History and Etymology for Arthrodira

New Latin, from arthr- + -dira (from Greek deirē neck); akin to Latvian grīva mouth of a river, Old Slavic griva mane, Sanskrit grīva neck, Latin vorare to devour

Keep scrolling for more

Learn More About Arthrodira

Time Traveler for Arthrodira

Time Traveler

The first known use of Arthrodira was in 1891

See more words from the same year

Dictionary Entries Near Arthrodira




See More Nearby Entries 

Statistics for Arthrodira

Cite this Entry

“Arthrodira.” Dictionary, Merriam-Webster, Accessed 26 Sep. 2021.

Style: MLA
MLACheck Mark Icon ChicagoCheck Mark Icon APACheck Mark Icon Merriam-WebsterCheck Mark Icon


Test Your Vocabulary

Difficult Spelling Words Quiz

  • alphabet pasta spelling help
  • Which is the correct spelling?
True or False

Test your knowledge - and maybe learn something along the way.

Universal Daily Crossword

A daily challenge for crossword fanatics.

Love words? Need even more definitions?

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