plural noun
Al·​lan·​toi·​dea | \ ˌalən‧ˈtȯidēə, ˌaˌlan‧-; əˌlantəˈwidēə\

Definition of Allantoidea

in some classifications
: a division of Vertebrata comprising all forms in which the embryo develops a complete allantois

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 Allantoidea

1860, in the meaning defined above

History and Etymology for Allantoidea

New Latin, from allantoid-, allantois

Keep scrolling for more

Learn More about Allantoidea

Share Allantoidea

Statistics for Allantoidea

Look-up Popularity

Time Traveler for Allantoidea

The first known use of Allantoidea was in 1860

See more words from the same year

Comments on Allantoidea

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


excited commotion or publicity

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:
How Strong Is Your Vocabulary?

Test your vocabulary with our 10-question quiz!

Word Winder's CrossWinder

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!