a convex fold or elevation in the surface of the brain

A convoluted ridge between grooves; a convolution; as, the gyri of the brain; the gyri of brain coral. See Brain.

Convolution, one of the prominent rounded elevations on the surface of the hemispheres of the brain; they are separated from each other by more or less deep furrows, the fissures or sulci.

Singular of gyri.

Gyri. A cerebral convolution; a ridge between two grooves.

Behind this is the angular gyrus which is connected with visual word memory. – The Brain and the Voice in Speech and Song by F. W. Mott