GNU Collaborative International Dictionary of English

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1.       
   ‖Gyrus (jīˈrŭs), n.; pl. Gyri (jīˈrī). [L. See Gyre, n.] A convoluted ridge between grooves; a convolution; as, “the gyri of the brain; the gyri of brain coral”.  See Brain.
   
   [1913 Webster]