fissures

/F IH1 SH ER0 Z/
noun
  1. 1

    A crack or opening, as in a rock.

  2. 2

    A groove, deep furrow, elongated cleft or tear; a sulcus.

verb
  1. 1

    To split, forming fissures.

Source: https://en.wiktionary.org/wiki/fissure, https://en.wiktionary.org/wiki/fissures