ammonoid

noun
am·​mo·​noid | \ ˈa-mə-ˌnȯid How to pronounce ammonoid (audio) \

Definition of ammonoid

: ammonite Mesozoic ammonoids

First Known Use of ammonoid

1866, in the meaning defined above

Learn More About ammonoid

Time Traveler for ammonoid

Time Traveler

The first known use of ammonoid was in 1866

See more words from the same year

Dictionary Entries Near ammonoid

ammono-

ammonoid

Ammonoidea

See More Nearby Entries 

Statistics for ammonoid

Cite this Entry

“Ammonoid.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/ammonoid. Accessed 23 May. 2022.

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

More from Merriam-Webster on ammonoid

Britannica.com: Encyclopedia article about ammonoid

WORD OF THE DAY

Test Your Vocabulary

Which Word Does Not Belong?

  • one green toy robot amidst many red toy robots
  • Which of these words does not mean "nonsense"?
Spell It

Can you spell these 10 commonly misspelled words?

TAKE THE QUIZ
Universal Daily Crossword

A daily challenge for crossword fanatics.

TAKE THE QUIZ
Love words? Need even more definitions?

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