sulcus

/หˆsสŒl.kษ™s/
noun
  1. 1

    A furrow or groove in an organ or a tissue.

  2. 2

    Any of the grooves that mark the convolutions of the surface of the brain.

  3. 3

    A region of subparallel grooves or ditches formed by a geological process.

Synonyms

Source: https://en.wiktionary.org/wiki/sulcus