noun
- plural of sac; bag-like structures or containers, especially in biology
Examples
- The air sacs in the lungs help with gas exchange.
- Spiders store venom in special sacs.
- The flower’s pollen sacs burst open in spring.
- Birds have air sacs that make their bones lighter.
- The doctor examined the fluid-filled sacs around the joint.
- Egg sacs protect developing spider babies.