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Synonyms
fis·sure (fĭsh́ər)

[Middle English, cut, from Old French, from Latin fissūra, from fissus, split; see fissi–.]

noun 

  1. A long narrow opening; a crack or cleft.
  2. The process of splitting or separating; division.
  3. A separation into subgroups or factions; a schism.
  4. Anatomy A normal groove or furrow, as in the liver or brain, that divides an organ into lobes or parts.
  5. Medicine A break in the skin, usually where it joins a mucous membrane, producing a cracklike sore or ulcer.

intr. & tr.v.: -sured, -sur·ing, -sures. 

To form a crack or cleft or cause a crack or cleft in.