ar·​chae·​or·​nis | \ ˌärkēˈȯrnə̇s\

Definition of archaeornis

1 capitalized : a genus of Upper Jurassic birds (subclass Archaeornithes) having a long feathered tail, showing reptilian characteristics in the absence of a bill, presence of teeth in the jaws, and on the wings three free digits with claws
2 plural -es : a bird or fossil of the genus Archaeornis

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!

First Known Use of archaeornis

1927, in the meaning defined at sense 1

History and Etymology for archaeornis

New Latin, from archae- + -ornis

Keep scrolling for more

Learn More about archaeornis

Statistics for archaeornis

Look-up Popularity

Time Traveler for archaeornis

The first known use of archaeornis was in 1927

See more words from the same year

Comments on archaeornis

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


a period when something is suspended

Get Word of the Day daily email!

Test Your Vocabulary

Summer 2019 Words of the Day Quiz

  • a-bowl-of-peach-sorbet-with-cut-peaches-next-to-it
  • Which is a synonym of desideratum?
True or False

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


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!