con·vo·lu·tion

1. A form or part that is folded or coiled.
2. One of the convex folds of the surface of the brain.

1. a twisting together; a turn, twist, or coil
2. an intricate, involved, or confused matter or condition
3. (Life Sciences & Allied Applications / Anatomy) Also called gyrus any of the numerous convex folds or ridges of the surface of the brain
convolutional , convolutionary adj