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[suhl-kuh s] /ˈsʌl kəs/
noun, plural sulci
[suhl-sahy] /ˈsʌl saɪ/ (Show IPA)
a furrow or groove.
Anatomy. a groove or fissure, especially a fissure between two convolutions of the brain.
Origin of sulcus
1655-65; Latin: furrow
Related forms
subsulcus, noun, plural subsulci. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for sulcus
  • The space between the gum and tooth, called the sulcus.
  • The sulcus is the main place where periodontal problems begin.
  • The fibers run forward through the medulla oblongata, and emerge in the antero-lateral sulcus between the pyramid and the olive.
  • The coronary sulcus can be indicated by a line from the third left, to the sixth right, sternocostal joint.
  • The preauricular sulcus is more commonly present and better marked.
  • The superficial stratum is inserted into the skin of the transverse sulcus which separates the toes from the sole.
British Dictionary definitions for sulcus


noun (pl) -ci (-saɪ)
a linear groove, furrow, or slight depression
any of the narrow grooves on the surface of the brain that mark the cerebral convolutions Compare fissure
Word Origin
C17: from Latin
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
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Word Origin and History for sulcus

plural sulci, Latin, literally "furrow, trench, ditch, wrinkle."

Online Etymology Dictionary, © 2010 Douglas Harper
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sulcus in Medicine

sulcus sul·cus (sŭl'kəs)
n. pl. sul·ci (-kī, -sī)

  1. Any of the grooves on the brain surface, bounding the gyri; a fissure.

  2. A long narrow groove or depression, as in an organ or a tissue.

sul'cal adj.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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