sac

word

Definition

A 'sac' is a small, bag-like part inside a living thing that holds liquid or other substances. It is often used in biology or anatomy.

Usage & Nuances

Mostly used in scientific or medical contexts. Common phrases: 'amniotic sac', 'air sac', 'yolk sac'. Not used for everyday bags or purses.

Example Sentences

The embryo grows inside the amniotic sac.

basic

A bird’s lung has many air sacs to help it breathe.

basic

The gallbladder is a sac that stores bile.

basic

During pregnancy, the amniotic sac protects the growing baby.

natural

If an air sac bursts, it can make breathing difficult for the animal.

natural

Doctors checked the fluid inside the sac for any signs of infection.

natural