SINCE 1828
Ammonoidea
plural noun
Am·mo·noi·dea
| \ ˌaməˈnȯidēə\
Definition of Ammonoidea
: an order of extinct chiefly Mesozoic Tetrabranchia comprising cephalopods having an external chambered shell that is either straight or variously curved or coiled — see ammonite entry 1
Keep scrolling for more
Comments on Ammonoidea
What made you want to look up Ammonoidea? Please tell us where you read or heard it (including the quote, if possible).
Test Your Vocabulary
Finance Words Quiz
-
- The etymology of mortgage is related most closely to which two words?
Test your knowledge - and maybe learn something along the way.
TAKE THE QUIZ
Test Your Knowledge - and learn some interesting things along the way.
TAKE THE QUIZLove words? Need even more definitions?
Merriam-Webster unabridged
Words at Play
Ask the Editors
Share Ammonoidea
Resources for Ammonoidea