amniotic fluid

Tubes filled with amniotic fluid for amniocentesis The amniotic fluid is the protective liquid contained by the amniotic sac of a gravid amniote. This fluid serves as a cushion for the growing fetus, but also serves to facilitate the exchange of nutrients, water, and biochemical products between mother and fetus.

Colloquially, the amniotic fluid is commonly called water or waters (Latin liquor amnii).