ammonoid

noun

am·​mo·​noid ˈa-mə-ˌnȯid How to pronounce ammonoid (audio)
: ammonite
Mesozoic ammonoids

Word History

First Known Use

1866, in the meaning defined above

Time Traveler
The first known use of ammonoid was in 1866

Dictionary Entries Near ammonoid

ammono-

ammonoid

Ammonoidea

See More Nearby Entries 

Cite this Entry

“Ammonoid.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/ammonoid. Accessed 29 Nov. 2023.

Copy Citation

Share

More from Merriam-Webster on ammonoid

Britannica.com: Encyclopedia article about ammonoid

Love words? Need even more definitions?

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

Games & Quizzes

Play Quordle: Guess all four words in a limited number of tries. Each of your guesses must be a real 5-letter word.
Quordle Can you solve 4 words at once?
Play Blossom: Solve today's spelling word game by finding as many words as you can using just 7 letters. Longer words score more points.
Blossom Word Game You can make only 12 words. Pick the best ones!
Play Missing Letter: a crossword with a twist. Each of the 25 puzzle words start with a different letter of the alphabet. Which letter is missing?
Missing Letter A crossword with a twist
winning words from the national spelling bee logo
Spelling Bee Quiz Can you outdo past winners of the National Spelli...