An·​cy·​loc·​er·​as | \ ˌansəˈläsərəs\

Definition of Ancyloceras

: a genus of ammonoids having a partly uncoiled shell and the aperture of the living chamber directed toward the coiled part

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 Ancyloceras

1842, in the meaning defined above

History and Etymology for Ancyloceras

New Latin, from ankyl- + -ceras

Keep scrolling for more

Learn More about Ancyloceras

Share Ancyloceras

Statistics for Ancyloceras

Look-up Popularity

Time Traveler for Ancyloceras

The first known use of Ancyloceras was in 1842

See more words from the same year

Comments on Ancyloceras

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


to express emotion in a dramatic way

Get Word of the Day daily email!

Test Your Vocabulary

What did you just call me?! A Quiz

  • rows-of-various-emoji
  • If a member of the audience describes your speech as bombastic, does that person mean it is:
Name That Thing

Test your visual vocabulary with our 10-question challenge!

Dictionary Devil

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!