convolution

n. coiled form, twisted form; whorl; ridge on the surface of the brain (Anatomy)

For the usage in formal language theory, see convolution (computer science). In mathematics and, in particular, functional analysis, convolution is a mathematical operator which takes two functions f and g and produces a third function that in a sense represents the amount of overlap between f and a reversed and translated version of g.
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Noun
1. the shape of something rotating rapidly
(synonym) whirl, swirl, vortex
(hypernym) round shape
2. a convex fold or elevation in the surface of the brain
(synonym) gyrus
(hypernym) structure, anatomical structure, complex body part, bodily structure, body structure
(hyponym) frontal gyrus
(part-holonym) cerebrum
3. the action of coiling or twisting or winding together
(hypernym) change of shape
(derivation) convolve, convolute

n. convolution

(n.)
The state of being rolled upon itself, or rolled or doubled together; a tortuous or sinuous winding or fold, as of something rolled or folded upon itself.
  

(n.)
The act of rolling anything upon itself, or one thing upon another; a winding motion.
  

(n.)
An irregular, tortuous folding of an organ or part; as, the convolutions of the intestines; the cerebral convolutions. See Brain.