gyral

from WordNet (r) 3.0 (2006)

gyral
    adj 1: relating to or associated with or comprising a
           convolution of the brain; "the gyral sulcus"

from The Collaborative International Dictionary of English v.0.48

Gyral \Gy"ral\ (j[imac]"ral), a. [See {Gyre}.]
   1. Moving in a circular path or way; whirling; gyratory.
      [1913 Webster]

   2. (Anat.) Pertaining to a gyrus, or convolution.
      [1913 Webster]