sac

In a dark room, a doctor pointed to an hourglass shape glowing on the ultrasound screen: There was her amniotic sac, funneling into her dilated cervix, and there was their tiny daughter’s foot, dipping out.

From Salon ● May 27, 2026

Then came the worst part: I passed the amniotic sac.

From The Wall Street Journal ● May 13, 2026

In these cases, the sheer size of the cell and the presence of a large yolk sac prevent the actin ring from fully closing.

From Science Daily ● Feb. 28, 2026

The next day she was diagnosed with pericarditis - an inflammation of the fluid-filled sac around the heart.

From BBC ● Oct. 12, 2025

The torn edges of the artery's walls formed a bulging sac that held in blood flowing through the vessel.

From "Ambushed!" by Gail Jarrow

In another chapter, Mr. Haskell follows the path of an owlet moth into the cranefly orchid’s flower and lets us watch how sacs of pollen attach themselves to the insect’s eye.

From The Wall Street Journal ● Apr. 17, 2026

Fibroblasts play a key role in keeping the lungs' airways and air sacs stable and functional.

From Science Daily ● Apr. 3, 2026

Caitlin and Grace were in different amniotic sacs in the womb, so their parents believed they were fraternal twins.

From BBC ● Feb. 24, 2026

Ovarian cysts are fluid-filled sacs found in an ovary or on its surface.

From Los Angeles Times ● May 22, 2025

This wasn’t too difficult, as the younger boys took one look at the shiny, wrinkled gray sacs and turned away in horror; you couldn’t have paid them to put one in their mouths.

From "The Evolution of Calpurnia Tate" by Jacqueline Kelly