amnion

amnion Definition

am·nion (am′nē ən, -än′)

noun pl. -·ni·ons or -·nia-ə

the innermost membrane of the sac enclosing the embryo of a mammal, reptile, or bird: it is filled with a watery fluid (amniotic fluid)
a similar membrane of certain invertebrates, esp. insects

Etymology: Gr, dim. of amnos, lamb < IE *agwhnos > yean, L agnus

amnion Related Forms

am′·ni·ot′ic (-ät′ik) adjective or am′·ni·on′ic-än′ik

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