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/ˈjīrəs/ Noun, pl. gyri 1. A ridge on the cerebral cortex. It is generally surrounded by one or more sulci (depressions or furrows; sg. sulcus). ( 2. A ridge or fold on the cerebral cortex. ( 3. Any of the many sinuous ridges or bumps on the surface of the brain that is surrounded by one or more sulci. ( 4. A ridge or fold between two clefts on the cerebral surface in the brain. (Google Dictionary) 5. A convex fold or elevation in the surface of the brain. ( Word origin: From Latin gyrus “circle, circuit, career,” from Greek gyros “ring,...

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