amnion
[ am-nee-uh n ]
/ ˈæm ni ən /
noun, plural am·ni·ons, am·ni·a [am-nee-uh] /ˈæm ni ə/.
Anatomy, Zoology.
the innermost of the embryonic or fetal membranes of reptiles, birds, and mammals; the sac in which the embryo is suspended.
Zoology.
a similar membrane of insects and other invertebrates.
Origin of amnion
Words nearby amnion
Example sentences from the Web for amnion
British Dictionary definitions for amnion
amnion
/ (ˈæmnɪən) /
noun plural -nions or -nia (-nɪə)
the innermost of two membranes enclosing an embryonic reptile, bird, or mammal
See also chorion
Word Origin for amnion
C17: via New Latin from Greek: a little lamb, from
amnos a lamb
Medical definitions for amnion
amnion
[ ăm′nē-ən, -ŏn′ ]
n. pl. am•ni•ons
The thin, membranous sac filled with a serous fluid in which the embryo or fetus is enclosed and suspended in the uterus.
amniotic sac
Other words from amnion
am′ni•ot′ic (-ŏt′ĭk) null adj.Scientific definitions for amnion
amnion
[ ăm′nē-ən ]
A thin, membranous sac filled with a watery fluid (called the amniotic fluid) in which the embryo or fetus of a reptile, bird, or mammal is suspended during prenatal development. Also called amniotic sac