plural noun
An·​al·​lan·​toi·​dea | \ ¦aˌnalənˈtȯidēə, -naˌlanˈ- \

Definition of Anallantoidea

: the division of Vertebrata, including amphibians, fishes, and cyclostomes, in which no allantois, or at most a rudimentary one, is developed — compare anamniota

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!

Other Words from Anallantoidea

anallantoidean \ -​¦tȯidēən \ adjective or noun

First Known Use of Anallantoidea

1860, in the meaning defined above

History and Etymology for Anallantoidea

New Latin, from an- + allantois + -idea

Keep scrolling for more

Learn More about Anallantoidea

Time Traveler for Anallantoidea

Time Traveler

The first known use of Anallantoidea was in 1860

See more words from the same year

Statistics for Anallantoidea

Cite this Entry

“Anallantoidea.” The Dictionary, Merriam-Webster Inc., Accessed 12 December 2019.

Comments on Anallantoidea

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


a period of high artistic development

Get Word of the Day daily email!

Test Your Vocabulary

Semantic Drift Quiz

  • a twisty river
  • Which of the following was once a synonym for fun?
Spell It

Can you spell these 10 commonly misspelled words?

Bee Cubed

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!