1) Amnion 2) Amniotic sac 3) Prenatal procedures, pithily 4) Second-trimester exams 5) Short medical procedures 6) Tests done by OB-GYNs 1) Amnion 
Amnios is a 1991 computer game for the Amiga platform. It is a top-down multi-directional-scrolling shoot `em up, set on ten planets across ten levels. ...[biology] The amnios is a pouch in which an embryo develops. It is a defining characteristic of amniotes. The amnios is adjacent to the epidermis, formed by the ectoderm of the fetus, and is extremely elastic. In elephants, `The amnios is continued from the base of the umbilical cord upon the allantois, which is of considerable size, and is...
• (n.) Same as Amnion.
Am'ni·os noun Same as Amnion .