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[jahy-ruh s]
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noun, plural gy·ri [jahy-rahy] /ˈdʒaɪ raɪ/. Anatomy.
  1. a convolution, especially of the brain.
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Origin of gyrus

1835–45; < Latin gȳrus; see gyre
Related formssub·gy·rus, noun, plural sub·gy·ri.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for gyrus

Historical Examples

  • Latin, gyrus, the ring in which colts are driven round by horse-breakers.

    Elements of Morals

    Paul Janet

  • (404-359) and Gyrus the Younger: the battle of Kunaxa and the retreat of the ten thousand .

  • Gyrus, jī′rus, n. one of the rounded edges into which the surface of the cerebral hemisphere is divided by the fissures or sulci.

  • Elsewhere c was k. Before the same vowels g was j (dʒ), as in genus, gibbus, gyrus.

  • The calcarine fissure passed completely across the gyrus frontitatus on both sides in two cases, on one side in four cases.


    Eugene S. Talbot

British Dictionary definitions for gyrus


noun plural gyri (ˈdʒaɪraɪ)
  1. another name for convolution (def. 3)
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Word Origin

C19: from Latin; see gyre
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for gyrus


convolution between grooves, 1842, from Latin gyrus "circle, circuit, career," from Greek gyros "ring, circle" (see gyre).

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Online Etymology Dictionary, © 2010 Douglas Harper

gyrus in Medicine


n. pl. gy•ri (-rī′)
  1. A rounded ridge, as on the surfaces of the cerebral hemispheres.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

gyrus in Science


Plural gyri
  1. A rounded ridge, as on the surfaces of the cerebral hemispheres.
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The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.