SINCE 1828
amnion
noun
am·ni·on
| \ ˈam-nē-ˌän
, -ən\
, -ən\
plural amnions
or amnia\ -nē-ə
\
\
Definition of amnion
1
: a thin membrane forming a closed sac about the embryos or fetuses of reptiles, birds, and mammals and containing the amniotic fluid
2
: a membrane analogous to the amnion and occurring in various invertebrates
Keep scrolling for more
Other Words from amnion
amniotic
\ ˌam-nē-ˈä-tik
\
adjective
\
adjective
Keep scrolling for more
Keep scrolling for more
More Definitions for amnion
amnion
noun
am·ni·on
| \ ˈam-nē-ˌän, -ən
\
\
plural amnions
or amnia\ -nē-ə
\
\
Medical Definition of amnion
: a thin membrane forming a closed sac about the embryos and fetuses of reptiles, birds, and mammals and containing the amniotic fluid
— called also amniotic sac
Comments on amnion
What made you want to look up amnion? Please tell us where you read or heard it (including the quote, if possible).
Test Your Vocabulary
Farm Idioms Quiz
-
- What does 'poke' refer to in the expression 'pig in a poke'?
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
Word Games
-
Farm Idioms Quiz
Not your children's farm quiz.
Take the quiz -
Up in the Sky: A Quiz
It's a bird? It's a plane? No, I'm really asking. What is it?
Take the quiz -
True or False?
Test your knowledge - and maybe learn something along the way.
Take the quiz -
SCRABBLE® Sprint
SCRABBLE® fans, sharpen your skills!
Play the game
Share amnion
Resources for amnion