#amniotic_cavity  the fluid-filled cavity that surrounds the developing embryo
  supertype:  bodily_cavity__cavity__cavum  (anatomy) a natural hollow or sinus within the body
  part:  amniotic_fluid__amnionic_fluid__waters  the serous fluid in which the embryo is suspended inside the amnion; "before a woman gives birth her waters break"

No statement uses or specializes amniotic_cavity; click here to add one.