adjective al·lan·to·am·ni·on·ic
variants: or


Definition of allantoamnionic

  1. :  relating to the allantois and amnion especially when fused into a single membrane — compare chorioallantois

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.

Join MWU now and get access to America’s largest dictionary, with:

  • 300,000 words that aren't in our free dictionary
  • Expanded definitions, etymologies, and usage notes
  • Advanced search features
  • Ad free!

Origin and Etymology of allantoamnionic

allant- + amnionic or amniotic

First Known Use: 1947

Seen and Heard

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


a trip made at another's expense

Get Word of the Day daily email!