Definitions

1. noun

A small blood vessel that is a terminal branch of a arteriole and that allows the exchange of oxygen, carbon dioxide, and other substances between the blood and the tissues.

“The capillary network in the lungs is crucial for exchanging oxygen and carbon dioxide.”

2. noun

A small tube or channel, especially one that is part of a network or system.

“The capillary action of water in the paper towel helped to spread the stain.”

3. adjective

Relating to or resembling a capillary.

“The capillary action of the superabsorbent material made it ideal for use in diapers.”