noun, plural sulci [suhl-sahy] .
a furrow or groove.
Anatomy. a groove or fissure, especially a fissure between two convolutions of the brain.

1655–65; Latin: furrow

subsulcus, noun, plural subsulci. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
sulcus (ˈsʌlkəs)
n , pl -ci
1.  a linear groove, furrow, or slight depression
2.  Compare fissure any of the narrow grooves on the surface of the brain that mark the cerebral convolutions
[C17: from Latin]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

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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Example sentences
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.
Images for sulcus
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