noun
Word Origin mid 19th century: from Latin, from Greek guros ‘a ring’.
Scrabble Points: 9
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Outward fold on the brain surface
In neuroanatomy, a gyrus is a ridge on the cerebral cortex. It is generally surrounded by one or more sulci (depressions or furrows; sg.: sulcus). Gyri and sulci create the folded appearance of the brain in humans and other mammals. Wikipedia
