Wiktionary
amniotic sacs
n. (plural of amniotic sac English)
Usage examples of "amniotic sacs".
Human blood temperature, baby mass, and if that weren't enough, tiny individual vid spy cameras built in, with lights, to view the replicators' inhabitants in real time, floating peacefully in their amniotic sacs.
They were thumb-sized and milky pale, heads as large as their bodies, with their fluid-filled amniotic sacs billowing about them.