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  1. plural of gyrus.


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

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 gyri

Historical Examples

  • There are three or four gyri disposed round each other, of which the lowest surrounds the Sylvian fissure.

    The Cambridge Natural History, Vol X., Mammalia

    Frank Evers Beddard

  • In the occipital lobe, on the contrary, the gyri were complete in number and of regular arrangements.


    Eugene S. Talbot

  • This is usually H-shaped, and the gyri are therefore anterior, posterior, external and internal.

British Dictionary definitions for gyri


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

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 gyri



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

Online Etymology Dictionary, © 2010 Douglas Harper

gyri in Medicine


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

gyri in Science


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