convolution
con.vo.lu.tion \.ka:n-v*-'lu:-sh*n\ \-shn*l, -sh*n-*l\ n 1: one of the irregular ridges upon the surface of the brain and esp. of th e cerebrum of higher mammals 2: a convoluted form or structure - con.vo.lu.tion.al aj
Webster's English Dictionarycon.vo.lu.tion \.ka:n-v*-'lu:-sh*n\ \-shn*l, -sh*n-*l\ n 1: one of the irregular ridges upon the surface of the brain and esp. of th e cerebrum of higher mammals 2: a convoluted form or structure - con.vo.lu.tion.al aj