Medical Dictionary

amnion

noun am·ni·on \ˈam-nē-ˌän, -ən\
plural amnions or am·nia \-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
April 18, 2015
wimple Hear it
to veil, ripple, or meander
Take a 3-minute break and test your skills!
How to use a word that (literally) drives some people nuts.
Test your vocab with our fun, fast game
Ailurophobia, and 9 other unusual fears