‖Gy″rus (jī″rŭs), n.; pl.Gyri (–rī). [L. See Gyre, n.] A convoluted ridge between grooves; a convolution; as, the gyri of the brain; the gyri of brain coral. See Brain.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.