| n. | 1. | Bark, as of a tree; hence, an outer covering. |
| 2. | (Med.) Bark; rind; specifically, cinchona bark. | |
| 3. | (Anat.) The outer or superficial part of an organ; |
| Noun | 1. | cortex - the layer of unmyelinated neurons (the gray matter) forming the cortex of the cerebrum |
| 2. | cortex - the tissue forming the outer layer of an organ or structure in plant or animal Antonyms: medulla - the inner part of an organ or structure in plant or animal |
| Cortex - An experimental slow controls project at CERN. |