Sulcus (anatomy)- A groove, crevice, or furrow.Plural sulci used in Latin to refer to a groove, furrow or trench. used in planetary geology to refer to subparallel grooves and ditches formed by geological processes. See Sulcus (geology) used in medicine, botany and zoology to refer to grooves, crevices, and furrows. for example, superior pulmonary sulcus See Sulcus (anatomy) for sulci specifically in the brain, see sulcus (neuroanatomy). Sulci's also an ancient town in southwest Sardinia,… (More on Sulcus)