Anallantoidea

plural noun

An·​al·​lan·​toi·​dea

¦aˌnalənˈtȯidēə,

-naˌlanˈ-

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

anallantoidean

-¦tȯidēən

adjective or noun

Word History

Etymology

New Latin, from an- + allantois + -idea

First Known Use

1860, in the meaning defined above

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!