What is the meaning of Cortex?

The outer layer of an internal organ or body structure, such as the kidney or the brain.

The tissue of a stem or root that lies inward from the epidermis, but exterior to the vascular tissue.

The outer surface of a piece of flint.

cortex

The bark of a tree; the bark of a cork tree; cork.

The shell or outward part or covering of anything else; body.

Life preserver (made of bark)

cortex

Source: wiktionary.org