| Cortex 1. (n.) Bark, as of a tree; hence, an outer covering. 2. (n.) Bark; rind; specifically, cinchona bark. 3. (n.) The outer or superficial part of an organ; as, the cortex or gray exterior substance of the brain. Thesaurus Entries armature, armor, armor plate, bark, body armor, border, buckler, bulletproof vest, chain armor, chain mail, chitin, circumference, coat of mail, cork, covering, crust, elytron, envelope, epicarp, epidermis, episperm, exterior, external, facade, face, facet, fringe, front, habergeon, harness, hauberk, integument, lineaments, lorica, lorication, mail, needles, outer face, outer layer, outer side, outer skin, outline, outside, panoply, peel, peeling, pericarp, periphery, phellum, plate, plate armor, protective covering, rind, scute, scutum, shell, shield, skin, spines, suit of armor, superficies, superstratum, surface, test, testa, thick skin, top |