| cortex | (noun) the tissue forming the outer layer of an organ or structure in plant or animal | - |
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| (noun) the layer of unmyelinated neurons (the grey matter) forming the cortex of the cerebrum | Synonyms: cerebral cortex, cerebral mantle, pallium |
| (noun) the tissue that surrounds the lens nucleus | Synonyms: lens cortex |
| neocortex | (noun) the cortical part of the neencephalon | Synonyms: neopallium |
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| paleocortex | (noun) the olfactory cortex of the cerebrum | Synonyms: archipallium |
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| vertex | (noun) the point of intersection of lines or the point opposite the base of a figure | - |
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| (noun) the highest point (of something) | Synonyms: acme, apex, peak |
| vortex | (noun) a powerful circular current of water (usually the result of conflicting tides) | Synonyms: maelstrom, whirlpool |
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| (noun) the shape of something rotating rapidly | Synonyms: convolution, swirl, whirl |