sulcus

[suhl-kuh s] /ˈsʌl kəs/
noun, plural sulci
[suhl-sahy] /ˈsʌl saɪ/ (Show IPA)
1.
a furrow or groove.
2.
Anatomy. a groove or fissure, especially a fissure between two convolutions of the brain.
Origin
1655-65; Latin: furrow
Related forms
subsulcus, noun, plural subsulci.
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

sulcus

/ˈsʌlkəs/
noun (pl) -ci (-saɪ)
1.
a linear groove, furrow, or slight depression
2.
any of the narrow grooves on the surface of the brain that mark the cerebral convolutions Compare fissure
Word Origin
C17: from Latin
Word Origin and History for sulcus
n.

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

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.