Definitions

1. noun

The outer layer of tissue forming the surface of the brain or of certain other organs.

“The neuroscientist examined the cortex of the patient’s brain.”

2. noun

The outer layer or bark of a tree.

“The cortex of the tree provided a natural barrier against pests.”

3. noun

A layer or region of the surface of an organ.

“The cortex of the kidney played a crucial role in filtering waste.”

4. noun

In botany, the outer layer of cells on a root.

“The cortex of the root helped to absorb nutrients from the soil.”