convolution

[kon-vuh-loo-shuhn]
noun
1.
a rolled up or coiled condition.
2.
a rolling or coiling together.
3.
a turn of anything coiled; whorl.
4.
Anatomy. one of the sinuous folds or ridges of the surface of the brain.

Origin:
1535–45; < Latin convolūt- (see convolute) + -ion

convolutional, convolutionary [kon-vuh-loo-shuh-ner-ee] , adjective


3. twist, winding, sinuosity.
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World English Dictionary
convolution (ˌkɒnvəˈluːʃən)
 
n
1.  a twisting together; a turn, twist, or coil
2.  an intricate, involved, or confused matter or condition
3.  Also called: gyrus any of the numerous convex folds or ridges of the surface of the brain
 
convo'lutional
 
adj
 
convo'lutionary
 
adj

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

convolution
1540s, from L. convolutus, pp. of convolvere "to roll together," from com- "together" + volvere "to roll" (see vulva).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

convolution con·vo·lu·tion (kŏn'və-lōō'shən)
n.

  1. A form or part that is folded or coiled.

  2. One of the convex folds of the surface of the brain.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
The grooves and folds in the cerebral cortex are called convolutions.
But it makes little narrative sense, tripping up on its own convolutions and
  fatally lacking in tension.
New studies are revealing how the brain's convolutions take shape.
The large intestine, in its course, describes an arch which surrounds the
  convolutions of the small intestine.
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